Questions on Word Problems: Age answered by real tutors!

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Question 105637: Courtney is 26 years older than Minili. In 10 years, Courtney will be twice as old as Minili. How old is each of them now?
I got C = 42 now
and M = 16 now
I set it up like this
2 (C-26) + 10 = C + 10
I was told by my teacher to set it up like this:
2 (C-26+10) = C+10
I cannot get an answer to show that she is 26 years older that way. Please let me know what I am doing wrong?
Click here to see answer by ankor@dixie-net.com(22740)

Question 105716: Richards age in 11 years will be three times what it was 15 years ago. How old is Richard now?
Click here to see answer by fmo(8)

Question 105730: The equation V = -2000t + 21,000 describes the value in dollars of a certain model of car after it is t years old. If a car is worth $11,000, substitute 11,000 into the equation to find the age of the car.
Please explain step-by-step.
Click here to see answer by bucky(2189)

Question 105711: Paula is 12 years older than brother Bob. In 4 years, Bob will be 2/3 as old as Paula. How old are they now?
Click here to see answer by jermz69(5)

Question 105795: A man is 30 years older than his son. In 17 years his son would be half his age. How old is his son?
Click here to see answer by ankor@dixie-net.com(22740)

Question 101986: Alice is 10 years less than twice as old as Bonnie. If the sum of the ages is 26. Find the ages.
Click here to see answer by BurningFlame_marc(77)

Question 101055: translate each into an equation:
if 8 is added to the variable T , the sum is equal to the varible B
Click here to see answer by BurningFlame_marc(77)

Question 105987: woman's age is 7/10 of man's age. In 4 years the woman's age will be 8/11 of the man's age. How old is the man?
Click here to see answer by edjones(8007)

Question 106045: Michelle is eight years older than Adam. Three years ago Michelle was twice as old as Adam was then. How old is Michelle?
Click here to see answer by ankor@dixie-net.com(22740)

Question 106246: john is x years old. his father is 3 times as old as he is. his mother is 3 years younger than his father. find the sum of their ages in terms of x in 10 years time.
Click here to see answer by ptaylor(2198)

Question 106274: Halley's Comet appears about every 75 years. One appearance was the year Mark Twain was born. The next appearance was the year he died. The sum of these two years is 3745. In what year did Mark Twain die?
Click here to see answer by MathLover1(20849)

Question 106328: Jane has two electronic beepers. One of them beeps every 4 seconds;
and the other beeps every 6 seconds. If they are turned on at exactly the same time,
how many times during the next hour will both beepers beep at the same time?

Click here to see answer by stanbon(75887)

Question 106390: A 2-metre long wire is cut into 5 pieces. three of the shorter pieces have lenghts in cm, which are consecutive whole numbers while the two lnger pieces are each x cm. find the lenght of the shortest piece.
Click here to see answer by josmiceli(19441)

Question 106627: A father is 4 times as old as his son. In 20 years he will be twice as old. How old are they now?
years,

Click here to see answer by HyperBrain(694)

Question 106637: 8. Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?
A) 8
B) 10
C) 12
D) 14

Click here to see answer by HyperBrain(694)

Question 107010: In 1985, the Lincoln Memorial was 1 1/2 times as old as the Jefferson Memorial. If the Lincoln Memorial was built 21 years before the Jefferson Memorial, give the year each memorial was built.
Click here to see answer by scott8148(6628)

Question 107157: I do not know how to set up an equation for this word sentence. I was able to come up with an answer that works in my head by I do not know how to write an equation for it on paper.
The question is: A father is four times as old as his daughter is now. In 20 years, he will be only twice as old as his daugher. How old are the father and daughter now.
The answer I came up with was 7 and 28.
Please help.
Click here to see answer by ankor@dixie-net.com(22740)

Question 107452: ``Two Russian mathematicians meet on a plane.
�If I remember correctly, you have three sons,� says Ivan. �What are their ages today?�
�The product of their ages is thirty-six,� says Igor, �and the sum of their ages is exactly today�s date.�
�I�m sorry, Igor,� Ivan says after a minute, �but that doesn�t tell me the ages of your boys.�
�Oh, I forgot to tell you, my youngest son has red hair.�
�Ah, now it�s clear,� Ivan says. �I now know exactly how old your three sons are.�
How did Ivan figure out the ages?

Click here to see answer by Edwin McCravy(20054)

Question 107547: Solve: The half-life of a substance is the time that it takes for half of the substance to remain after natural decay. If Uranium-238 has a half-life of 4.15 billion years, how long does it take for 90% of the substance to decay?
Click here to see answer by stanbon(75887)

Question 107571: A certain bacterial infection has 110,000 organisms at 12:00 p.m. on Wednesday at 12:30 on the same day the population was 140,000. If this growth rate has been steady, when did the infection start?
Click here to see answer by stanbon(75887)

Question 107575: It is estimated that at the present rate of deforestation in El Salvador, in 20 years only 53% of the present forest will remain. How long will it take to remove 95% of the forest?
Click here to see answer by josmiceli(19441)

Question 107585: How many quarts of pure antifreeze should Frida add to 10 quarts of a 20% antifreeze solution to make a 50% antifreeze solution?
Click here to see answer by checkley71(8403)

Question 107581: In the year 2006 it was discovered that global population was increasing at the annual rate of 1.7%. In what year will the global population be double?
Click here to see answer by josmiceli(19441)

Question 107580: In the year 2006 it was discovered that global population was increasing at the annual rate of 1.7%. In what year will the global population be double?
Click here to see answer by scott8148(6628)

Question 107723: In november 2003 my grandpa was eleven times as old as me. in november 2012 my grandpa will be three times as old as me. how old was i in november 2003?

Click here to see answer by josmiceli(19441)

Question 107775: Janet Kim is now 13 years old. Her father, Jeong, is now 31.
a.Write and expression for each person's age x years from now.
b.Write and equation stating that Jeong is twice as old as Janet.
Then solve it to find when Jeong is twice as old.
c.When is Jeong three times as old as Janet?
d. Write an equation stating that Jeong is exactly as old as Janet.
When will this be true?
e. Write an equation stating that Janet's age is 18 years less than Jeong's age. When will this be true?
f. When will the sum of their ages be:
i. 85; ii.36?
Click here to see answer by josmiceli(19441)

Question 107837: alex is 2 years older than dulce. if the sum of their ages is 54. how old is alex?
Click here to see answer by scott8148(6628)

Question 108127: Ann is 6 years older than Mary. She is also twice as old as Mary was when Ann was as old as Mary is now. How old is each now?
Click here to see answer by MathLover1(20849)

Question 108129: I am trying to help my daughter but we cannot set up this problem can you please help us thank you.
For six consecutive years a man's age was a multiple of his granddaugters age. How old was each during the sixth year?
Click here to see answer by Fombitz(32388)

Question 108130: I am trying to help my daughter but we cannot set up this problem can you please help us thank you.
For six consecutive years a man's age was a multiple of his granddaugters age. How old was each during the sixth year?
Click here to see answer by ankor@dixie-net.com(22740)

Question 108256: Karen is 15 years older than Kyla. 13 years from now the sum of their ages will be 109. Give the current ages of Karen and Kyla.
Click here to see answer by checkley71(8403)

Question 108257: Scott is 22 years older than Sun Jung, In 7 years, Scott will be twice as old as Sun Jung. Give the current age of Scott and Sun Jung.
Click here to see answer by ankor@dixie-net.com(22740)

Question 108374: *GLOBAL POPULATION (P) INCREASED EXPONENTIALLY AT A RATE OF 1.8% PER ANNUM FROM 1950 TO 1980. GLOBAL FOOD PRODUCTION (F)INCREASED LINEARLY DURING THE SAME PERIOD FROM 370 billion kg to 1650 billion kg. THE GLOBAL POPULATION IN 1950 WAS 2.6 BILLION(2,556,518,868)HUMANS.
WHAT IS THE EQUATION THAT PREDICTS THE POPULATION OVER THIS PERIOD AS A FUNCTION OF TIME, ALSO WRITE THE EQUATION THAT SHOWS FOOD PRODUCTION OVER THIS PERIOD OF TIME.
USE YOUR EQUATION TO FIND THE POPULATION AND THE FOOD PRODUCTION IN 1976.
WHAT WOULD BE THE POPULATION IN 2007?
Click here to see answer by Fombitz(32388)

Question 108497: six years ago bob was four times as old as mary. in four years he will be twice as old as mary. how old are they now? use a system of equations.
Click here to see answer by bnyken(1)

Question 108828: Weight on Mars: The weight M of an object on Mars varies directly as its weight E on Earth. A person who weighs 95 lbs on Earth weights 38 lbs on Mars. How much would a 100 lb person weigh on Mars?

Click here to see answer by Fombitz(32388)

Question 108863: RICARDO IS 4 YEARS LESS THAN TWICE AS OLD AS HIS SISTER.
THE SUM OF THEIR AGES IS 20.
HOW OLD IS RICARDO?
Click here to see answer by elima(1433)

Question 109938: If stephanie father is 4 times as old as stephanie and the sum of both ages is 50 years old. How old is stephanie's father.
Click here to see answer by checkley71(8403)

Question 109938: If stephanie father is 4 times as old as stephanie and the sum of both ages is 50 years old. How old is stephanie's father.
Click here to see answer by lesfarley(1)

Question 109919: A. Solve the following quadratic equations. Make sure to show all your work. Do not use any method (e.g., factoring, completing the square, quadratic formula, graphing) more than twice. Use the graphing method at least once.
1. 3x2 + 11x � 20 = 0
2. x2 + 3x � 4 = 0
3. 3x2 � x � 1 = 0
B. State the different methods you used to solve each equation. Make sure that your work demonstrates both algebraic and graphing methods.: A. Solve the following quadratic equations. Make sure to show all your work. Do not use any method (e.g., factoring, completing the square, quadratic formula, graphing) more than twice. Use the graphing method at least once.
1. 3x2 + 11x � 20 = 0
2. x2 + 3x � 4 = 0
3. 3x2 � x � 1 = 0
B. State the different methods you used to solve each equation. Make sure that your work demonstrates both algebraic and graphing methods.
Answer by checkley71(5186) About Me (Show Source):
You can put this solution on YOUR website!
3X^2+11X-20=0
(3X-4)(X+5)=0
3X-4=0
3X=4
X=4/3 ANSWER.
X+5=0
X=-5 ANSWER.
------------------------------------------
x^2+3x-4=0
x = (-b +- sqrt( b^2-4*a*c ))/(2*a)
x=(-3+-sqrt[3^2-4*1*-4])/2*1
x=(-3+-sqrt[9+16])/2
x=(-3+-sqrt25)/2
x=(-3+-5)/2
x=(-3+5)/2
x=2/2
x=1 answer.
x=(-3-5)/2
x=-8/2
x=-4 answer.
--------------------------------------------
3X^2-X-1=0
Y=3X^2-X-1 FOR THE GRAPHING METHOD:
graph( 300, 200, -6, 5, -10, 10, y = 3x^2 -x -1) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = 3x^2 -x -1).
---------------------------------------------
Teacher comments when I submitted this answer
1.The graphing method is incomplete.
2.The third equation is graphed, but the solutions are not identified. Where are they located? I need help with this

Click here to see answer by checkley71(8403)

Question 110317: Melinda's dad is 30 years older than Melinda is now. Eight years ago, his age was equal to the squaer of Melinda's age then. How old is Melinda now?
Click here to see answer by solver91311(24713)

Question 110651: Graph the function f(x) = �3x + 7. Be sure to properly label the graph, which includes labeling the axes and the line with its equation.

B. Graph the function f(x) = �3x2 + x � 5. Be sure to properly label the graph, which includes labeling the axes and the graph with its equation.
Click here to see answer by MathLover1(20849)

Question 110637: Carlo is 12 years old and his grandfather is 66. When in the past has the grandfather been 10 times Carlo's age?
Click here to see answer by solver91311(24713)

Question 111146: Hello,
I am working on word problems in Algebra. Here is on of them.
The amount of time it takes a swimmer to swim a race varies inversely as the average speed of a swimmer. A swimmer finishes a race in 500 seconds with an average speed of three feet per second. Find the Average speed of the swimmer if it takes 375 seconds to finish the race.
How would I do this?!?
Algebra 1
Click here to see answer by dolly(163)

Question 111641: Hi plese help me wiyth this

My father is 42 and my dog is eight. If my dog were a human it would be 56. How old would my dad be if were a dog

thanks for any help coming on my way

Click here to see answer by checkley71(8403)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180