Questions on Algebra: Proportions answered by real tutors!

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Question 306545: solve for x in the following 3:80 x 150.
Click here to see answer by dabanfield(803)

Question 306568: I need help solving the proportion for the unknown variable 4/21 = x/168 Thanks
Click here to see answer by unlockmath(1614)

Question 307879: there are 730 pupils in a school the ratio of boys to girl is 5:7
calculate the number of boys in the school
Click here to see answer by mananth(12270)

Question 308014: Coffee drinkers. Among 100 coffee drinkers, 36 said they preferred their coffee black and the rest did not prefer their coffee black. Find the ratio of those who prefer black coffee to those who prefer nonblack coffee.
Click here to see answer by checkley77(12569)

Question 308681: which is a better value? 1.5 liters of coldrink at R10.62 or 1.2 liters of coldrink at R10.32?
Click here to see answer by Fombitz(13828)

Question 308682: in a photo of a father and his daughter,the daughters height is 2.3cm and the fathers is 5.8cm,if the father is actually 188cm tall,how tall is the daughter?
Click here to see answer by mananth(12270)

Question 308876: 8/x=24/9
Click here to see answer by vleith(2825)

Question 309173: If 4 grapefruits sell for 79 cents, how much will 6 grapefruits cost?
Click here to see answer by nyc_function(2733)

Question 309928: Use a proportion to find the unknown length in the pair of similar figures.
These both sahpes are triangles.
Figure A. Figure B.

CB= 144cm IH= 108cm
AC= 24cm GH= 126cm
AB= 168cm GI= _______
Please before 10:00 pm
I will be dead if i do not hand this sheet in tomorrow.
Thanks
Click here to see answer by toidayma(44)

Question 310492: 1 y
- = - -
8 5
Click here to see answer by JBarnum(2044)

Question 310511: I am a fifth grader and we are working on proportions. I know how to figure out the missing number in a proportion where the problem is 1/3 = 1-1/3/N. You change 1-1/3 into 4/3 and solve the equation.
I get totally confused when N is on the other side of the equation, for example, N/8=1/3. Since 8 does not go into 3 I tried going to the lowest denominator, 24 and I come up with N = 3/24. This doesn't look right. Please help.
Click here to see answer by JBarnum(2044)

Question 310706: At the same time of the day, a flagpole casts a ten meter (m) shadow while a six meter statue beside it casts a two meter shadow. What is the height of the flagpole?
Click here to see answer by nyc_function(2733)

Question 311089: what is an equation of the line that passes through the point (-2,5) and is perpendicular to the line whose equation is y=1/2x+5?
Click here to see answer by solver91311(17077)

Question 311343: Pierre paid $126 for a coat that was listed for $180. What rate of discount did he receive?
Click here to see answer by fractalier(2101)

Question 311343: Pierre paid $126 for a coat that was listed for $180. What rate of discount did he receive?
Click here to see answer by JBarnum(2044)

Question 311342: Tom bought an electric drill at a 30% discount sale for $35. What was the original price of the drill?
Click here to see answer by fractalier(2101)

Question 311344: if the cost of a pair of shoes is $32 for a retailer and he sells them for $44.80, what is his rate of profit based on the cost?
Click here to see answer by JBarnum(2044)

Question 311546: Please help! The ancient Greeks thought that the
most pleasing shape for a rectangle was one for which the
ratio of the length to the width was approximately 8 to 5,
the golden ratio. If the length of a rectangular painting is
2 ft longer than its width, then for what dimensions would
the length and width have the golden ratio?
Click here to see answer by ankor@dixie-net.com(15746)

Question 312506: Find the unknown quantity for the following ratios and proportions.
If the primary to secondary voltage ratio is 4:1 for a transformer, what is the secondary voltage if the primary voltage is 460 volts?
Click here to see answer by rfer(12730)

Question 312509:
One wire has a cross-sectional area of 1,250 cmil and a resistance of 7 ohms. A second piece of wire, identical except for cross-sectional area, has a resistance of 10 ohms. Determine what the cross-sectional area of this second wire is. (Cross-sectional area and resistance are inversely proportional.)
Click here to see answer by ankor@dixie-net.com(15746)

Question 312740: write as a unit rate: a car travels 256 mi on 8 gal of gas

Click here to see answer by rapaljer(4667)

Question 313096: 28 devided (-2)+24 divided (-6)
Click here to see answer by rfer(12730)

Question 313277: how do set up the proportion problem the numbers that are given are 40 inch hips the maximum ideal waist size is 32 inches. What is the maximum ideal waist size for a woman with a 35 inch waist

Click here to see answer by stanbon(57977)

Question 313598: Alice eats 1/4 of a pizza. Bob then eats 1/3 of what is left. Finally, Christine eats 1/2 of the remaining pizza. What proportion of the pizza did they not eat?
Click here to see answer by rapaljer(4667)

Question 313778: the perimeter of a triangle is 132cm and the lengths of its sides are in the ratio 8:11:14 . find the length each side ?
Click here to see answer by mananth(12270)

Question 314366: Please help me with this if you can. Thank you.
Solve.

Click here to see answer by rapaljer(4667)

Question 315421: The sale price was 90 percent of the regular price. If the regular price was $36, what was the sale price?
Click here to see answer by stanbon(57977)

Question 315781: A recipe calls for 2.8 cups of milk for every 6 cups of flour. how much milk would be required for 5.5 cups of flour. write a proportion you would use to solve.
Click here to see answer by rfer(12730)

Question 316182: A recipe calls for punch that serves 4 people calls for 1 and 1/2 teaspoons of sugar. If 3 teaspoons equals 1 tablespoon, how many tablespoons will be needed to make enough punch for 18 people?
Click here to see answer by Fombitz(13828)

Question 316574: If the ratio of boys to girls on a committee is 3:7 what percent of the committee are boys?
Click here to see answer by texttutoring(324)

Question 316532: A Spanish class has 18 boys and 22 girls. boys are what fraction of the class?
Click here to see answer by Fombitz(13828)

Question 316796: 1.0000eur is equivalent to 0.7615 u.s. dollars. use a proportion to convert $2500 to euro
3282.994090610636901 euros

Click here to see answer by dane(1)

Question 317013: The school cafeteria has found that they go through 9 sandwiches for every 7 tickets they sell to the students. Today they have 546 tickets for sale. How many sandwiches do they need to make?

Click here to see answer by JBarnum(2044)

Question 317039: difference between -4 and
Click here to see answer by Alan3354(31532)

Question 317331: 4x=12/15

Click here to see answer by stanbon(57977)

Question 317783: If 5 tractors can plow a field in 4 hours,how many hours will it take 3 tractors to plow a field?
Click here to see answer by jim_thompson5910(28717)

Question 318631: the actual distance is 75 feet. Find the distance on a scale drawing if the scale is 1 in :25 feet
Click here to see answer by solver91311(17077)

Question 319261: The intensity of a light source varies inversely as the square of the distance from the source. If the distance from a source increases by 25%, by what percent does the intensity decrease?
Click here to see answer by devjyotsingh24(4)

Question 319761: The ratio of sweetened lemon juice to water in lemonade is 2:7. How much lemonade
can you make if you use 5 cups of sweetened lemon juice?
Click here to see answer by josmiceli(9817)

Question 321113: Question 1: A tree casts a shadow that is about 10 ft. long. Javier, who is about 5 ft. tall, is standing near the tree. Javier's shadow is about 4 ft. long. What is the estimaated height, t, of the tree? Question #2: One gallon of paint will cover 400 square feet. How many gallons of paint are needed to cover a wall that is 8 feet high and 100 feet long? Question #3: A wedding cake has a diameter of 12 inches. The cake decorator needs to know how many strawberries he will need to put around the outside, so he needs the circumference. What is the circumference? Leave the answer in terms of pi. Question #4:The speed of an elevator varies inversely withthe weight it carries. If the elevator rises at 10 feet per second when it carries 400 lbs, how fast will it rise when it carries 500 lbs.
Click here to see answer by mananth(12270)

Question 323506: if 20 pounds of fertilizer will cover 1500 square feet of lawn, how many pounds of fertilizer are needed for 4275 square feet of lawn?
Click here to see answer by rfer(12730)

Question 323474: show me how to write and solve this word problem. 14 is what percent of 24

Click here to see answer by rfer(12730)

Question 324261: 1 number is twice another number, if the sum of their reciprocal is 1/4 find the 2 numbers
Click here to see answer by unlockmath(1614)

Question 324261: 1 number is twice another number, if the sum of their reciprocal is 1/4 find the 2 numbers
Click here to see answer by MathTherapy(1483)

Question 324466: 26% of 250 is what??? im confused on how to set it up percent * base = amount...then theres another way to work it out...im lostttttt. ty for your help
Click here to see answer by Fombitz(13828)

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