Questions on Algebra: Proportions answered by real tutors!

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Question 66512: A,B,C,D are 4 points on a line such that AB:AC=3:5 and BD:CD=7:2. If CD is
5cm long, find the length of AB?
Click here to see answer by checkley71(8403)

Question 66549: Use cross products to determine whether each of pair of ratios forms a proportion:
4/9, 12/27
Please explain how to solve this problem.
Click here to see answer by stanbon(57361)

Question 66610: a scale drawing of a basketball court has a scale of 1 inch : 9 feet. the basketball court is 94 feet by 50 feet. find the dimensions of the court in the drawing.
Click here to see answer by Nate(3500)

Question 66709: the shadow of a tree is 10 meters long, the shadow a meter stick is .4 meters long. how tall is the tree? 25 meters?
do you multiply .4 meters by 10 meters? Or do you convert to feet and divide?
Click here to see answer by Earlsdon(6287)

Question 66758: FIND EACH UNIT RATE.
$57 for 6 hours
Click here to see answer by rapaljer(4667)

Question 66975: I dont really know if this is about proportions, but can you please help me solve problems like this? 3hrs/min=56sec/m I really need to know early, because we have mid terms tomorrow. Can you please help?
Thank You
Click here to see answer by checkley71(8403)

Question 67027: The tram could cover 400 centimeters in 50 seconds. If the rate of the tram were reduced by one half during the thunderstorm, how far could the tram go in 20,00 seconds?
Click here to see answer by stanbon(57361)

Question 67201: Two cities on a map are 5.5 inches apart. The cities are actually 198 milles apart. What was the scale used to draw the map?
Click here to see answer by 303795(595)

Question 67476: please help me solve these question 120% of y is 42
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Question 67470: write as a percent 5/8 then 7/16 and 5/4
Click here to see answer by checkley71(8403)

Question 67549: the length of two pieces of wire are in the ratio 4:7.if the lenght of the longer piece is 3.5m, what is the length of the shorter piece?
Click here to see answer by ptaylor(2048)

Question 67903: Looking for help on solving proportion problem (6th grade math) 1.2/9 = c/1.5 . How do you solve this when you have mixed number? Another example we WERE able to solve is 3/4 = 12/b by cross cancelling (i.e., 4x12=3xb, 48=3b, 48/3=3b/3, 16=b. We just cannot figure out how to do this with a numerator that is a decimal???
thank you so much for any assistance you can give.
Click here to see answer by funmath(2925)

Question 68051: How do I:
"Write a proportion and solve"
--What percent of 80 is 42?
I came up with 52.5% I wrote this down
The teacher circled "write a proportion," and marked it wrong.
I did not show my work.
Sammy
Click here to see answer by stanbon(57361)

Question 68034: If I know that a + b + c = 100 and I also know that .5a + 3b + 10c = 100 how do I find the values of a, b and c?
Thanks
Click here to see answer by ankor@dixie-net.com(15652)

Question 68066: a - 3 3
------ = -
8 4
Click here to see answer by checkley71(8403)

Question 68280: Here is a question:
At an Italian restaurant there is a jug of heterogeneous oils that are composed of 20 liters of 93% oil type and 10 liters of pure neutral liquid.
Now, the 93% oils are on the bottom while the neutral liquid is less dense. How much of the oils must I take out of the bottom, so that when I shake the jug up, I get a heterogeneous solution of 64%?
Click here to see answer by Nate(3500)

Question 68313: The area of a rectangle is 216ft.2 (squared) The length of the rectangle is 18 ft. If a scale drawing of the figure has a scale of 1/2in. = 6 ft. What are the dimensions of the rectangle on the scale drwaing.
Click here to see answer by ptaylor(2048)

Question 68453: The revenue for a sandwich shop is directly proportional to its advertising budget. When the owner spent $2000 a month on advertising, the revenue was $120,000. If the revenue is now $180,000, how much is the owner spending on advertising?
Click here to see answer by funmath(2925)

Question 68452: m varies directly with n; m = 144 when n = 8.
Click here to see answer by funmath(2925)

Question 68556: In printing an article of 48,000 words, a printer decides to use two sizes of type. Using the larger type, a printed page contains 1,800 words. Using smaller type, a page contains 2,400 words. The article is allotted 21 full pages in a magazine. How many pages must be in smaller type?
Click here to see answer by rmromero(383)

Question 68714: The aspect ratio of a TV screen is the ratio of its length to its width. The aspect ratio of a standard TV screen is 4:3. The aspect ratio of a wide screen TV in United States is 16:9. Describe how you would tell whether a TV has a standard or wide screen given the length and width of the screen.
Click here to see answer by checkley71(8403)

Question 68791:
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Question 68792:
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Question 69079: The revenue for a sandwich shop is directly proportional to its advertising budget. when the owner spent $2000 a month on advertising, the revenue was $120,000. If the revenue is now $180,000, how much is the owner spending on advertising?
Click here to see answer by bucky(2189)

Question 69481: Find the constant variation of K.
m varies directly with n; m=144 when n=8.
Totally lost!
Click here to see answer by funmath(2925)

Question 20976: 12(m^2-8)=3m(4m+1)
please help
Click here to see answer by terbear1963(43)

Question 69917: 236.7 miles in 4.5 days
how many days for 1 mile?
331.5 pages in 8.5 weeks
how many weeks for 1 page?
Click here to see answer by checkley75(3666)

Question 70539: I am not sure how to set up a proportion to solve this.
It says heavier people burn more calories for the same activity and lighter people burn fewer. In fact, you can calculate similar figures for burning calories by setting up the appropriate proportion. Biking burns 410 c/h based on a 150-pound person.
At what rate would a 120-pound person burn calories while biking at 12 mi/h?
Do I use x calories/120 lb person = 12 miles/hour? I understand the basics of proportions and cross multiplying, then dividing by the coefficient, but this one stumped me on how to set it up.
Thanks in advance.
Click here to see answer by stanbon(57361)

Question 70594: 4. Two cards are randomly drawn from a standard deck of 52-playing cards without replacement. What is the probability of drawing a 2 followed by a 5?
Thank You
Vytas
Click here to see answer by checkley75(3666)

Question 25491: Hey Im sommer
what is 66% of 45? I tried but I dont under stand
Thank You
Click here to see answer by terbear1963(43)

Question 70791: Hello i need help with for proportion problems if it's possible,the first question is solve the proportion,4over3.2=2overx.The second one is solve the proportion,zover3=z+9over12.The next one is solve the proportion 16over4d+2=8over3.And the last one is find the probability that the name of a month of the year,chosen at random,begins with a consonant and that question the last one i really don't understand at all thanks for the help
Click here to see answer by checkley75(3666)

Question 70932: Use a map scale of 2 inches:25 miles fo find the actual distance for each measurment.
1.) 3 in.=
2.) 1/2 in.=
3.) 5 in.=
4.Anne lives 30 miles from her cousin.On a map she measures 3 in.between their homes.What is the scale of the map?
Click here to see answer by algebrapro18(206)

Question 71057: Twice a number equals the difference of 6 and 4 times its reciprocal. What are the possible numbers?
Click here to see answer by ankor@dixie-net.com(15652)

Question 60302: To Whomever can assist, Thank you!
x - 5/ 3 + 2 = 5/9
Click here to see answer by terbear1963(43)

Question 66844:

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Question 71526: a recipe for green salad for 70 people calls for 18 heads of lettuce. How many heads of lettuce would be needed for 176 people to be served?
Click here to see answer by ptaylor(2048)

Question 71879: Hello I couldn't find the section up here for models or scales but i had a some questions about this topic and I thank anyone who can help me.The first question is, A toy airplane is 10 inches long.If the actual airplane is 75 feet long,find the scale of the model.The next one is,An N-gauge train model is created using a scale of 1:160 ft.If an actual train engine,the K-4,an early twentieth-century engine,is 45 feet long,what is the length of an N-gauge model of the engine in inches.The third one is,The actual distance from Fargo,ND to Minneapolis,MN is 240 miles.If the scale on a map is 1 inch=20 miles,how long is a line on the map connecting the two cities.And the last one is,a bag contains 7 red marbles,3 blue marbles,and 6 green marbles.You choose a marble at random.What are the odds of choosing a green marble. Thank you for anyone that helps me
Click here to see answer by jim_thompson5910(28595)

Question 72195: 21 is 35% of what number?
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Question 72195: 21 is 35% of what number?
Click here to see answer by pradhyumna.kumar@gmail.com(62)

Question 72210: Find 0.1% of 450.
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Question 72209: 28 is 20% of what number?
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Question 72207: find 78.5% of 90.
Click here to see answer by pradhyumna.kumar@gmail.com(62)

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