Questions on Algebra: Proportions answered by real tutors!

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Question 386266: The ratio of boys to girls in a math class is 2 : 3. There are 18 girls in
the class. How many students are in the class?
Click here to see answer by stanbon(75887)

Question 385987: The amount of corn chips dispensed into a 12-ounce bag by the dispensing machine has been
identified as possessing a normal distribution with a mean of 12.5 ounces and a standard
deviation of 0.2 ounce. What proportion of the 12 ounce bags contain more than the advertised
12 ounces of chips?
Click here to see answer by scott8148(6628)

Question 386282: The ratio of flour to sugar in a recipe is 3 to 2. The recipe calls for 1 1/2
cups of flour, how much sugar is needed?
Click here to see answer by gwendolyn(128)

Question 386277: If Sarah paid $36 for a dozen golf balls, what is the cost for one ball?
Click here to see answer by rfer(16322)

Question 386268: If a gallon of paint covers 450 square feet, how many gallons of paint
are needed to paint a room that is 1350 square feet?
Click here to see answer by rfer(16322)

Question 386339: If a 0.27 cm long diamond appears to be 13.5 cm long under a microscope, what is the power of the microscope?
Click here to see answer by rfer(16322)

Question 386262: A flagpole casts a shadow of 36 feet. If a man 6 feet tall casts a shadow
8 feet long at the same time and location, how tall is the flagpole?
Click here to see answer by rfer(16322)

Question 386278: During the first day of a trip, Mike drove 264 miles and used 8 gallons
of gasoline. At this rate, how many gallons of gasoline will Mike use for a 1650 mile trip?
Click here to see answer by rfer(16322)

Question 386381: x/5 = 3x-4 / 7 (that's 3x-4 over 7....3x-4 / 7 not 3x - 4/7)
Click here to see answer by rfer(16322)

Question 386697: how many gallons of milk will 16 babies drink in 20 days?

Click here to see answer by unlockmath(1688)

Question 1021: 20% of what number is 8? How do you figure this? or how would you get the answer?
Click here to see answer by mariam(1)

Question 387069: how do you solve for proportions
Click here to see answer by tara0066(31)

Question 387431: A boy is 17 years old and his sister is twice as old. When the boy is 23 what will be the age
of his sister? ___________

Click here to see answer by ewatrrr(24785)

Question 387684: Solve the following proportion for u:
10/u = -5/u - 3
Click here to see answer by rfer(16322)

Question 387684: Solve the following proportion for u:
10/u = -5/u - 3
Click here to see answer by rapaljer(4671)

Question 387740: So there are two similar triangles, The larger one has (A)side that measures 34 ft, and (B) side that measures 9 ft. The smaller triangle has an (A) side that measures 20 ft and a (B) side that measures Y.
Find the unknown length y in the pair of similar triangles.
(Simplify your answer. Type an integer, fraction, or mixed number.)
Can anyone help. I'm stuck on this problem.
(Sorry, but I dont know how to draw triangles on this)
Click here to see answer by edjones(8007)

Question 388105: The sides of a triangle are 16,20,and 28. If the largest angle of this triangle is bisected,how long are the segments of the side that is divided by the angle bisector?
Click here to see answer by Fombitz(32388)

Question 388378: How many people could live in these dimensions?
1,377 miles wide. 1,377 miles long and 1,377 miles high?
Click here to see answer by Alan3354(69443)

Question 388343: A bookstore reduced the price of a book with 25%. after that the sale rose by 10%.
With how many percent rose the number of sold books?
Click here to see answer by robertb(5830)

Question 388609: a garrison of 1600 men is provisioned for 18 weeks at the rate of 25 kg per day per man.if some more persons join the garrison, the provisions would last for 16 weeks at the rate of 20 kg per day per man. find the number of persons joining the garrison.
Click here to see answer by mananth(16946)

Question 389204: A Suzuki Khyber car journey takes 4/1/2 (4 whole 1 over 2) hrs when the car travels at an average speed of 120 km/h. Calculate the time taken for the same journey when the average speed is reduced to 108 km/h.
Click here to see answer by mananth(16946)

Question 389355: if a:b :: c:d, show that
c^2 : d^2 = (a^2 +c^2): (b^2 + d^2)
Click here to see answer by robertb(5830)

Question 389359: If a:b :: c:d, show that:
ac : bd = (a^2+c^2):(b^2+d^2)
Click here to see answer by robertb(5830)

Question 389497: The amount of pollutants A entering the atmosphere is directly proportional to the population P living in an area. If 25000 tons of pollutants enter the atmosphere in an area with a population of 17750, how many tons of pollutants enter the atmosphere in Manila with a population of 2450500? ( need a complete solution) thanks

Click here to see answer by robertb(5830)

Question 389597: how do you find the gcf of 7 and 15
Click here to see answer by Alan3354(69443)

Question 389608: Last month a company made 1000 gloves with 60 workers. This month the company hired 15 more workers. At the same rate, how many gloves can be made this month?
Click here to see answer by sudhanshu_kmr(1152)

Question 389670: Hello, this is my question:
To be able to see your complete reflection in a mirror that is hanging on a wall, the mirror must have a minimum length of "m" inches. The values of "m" varies directly with your height "h" (in inches). A person 71 inches tall requires a 35.5 inch mirror. Write a linear model that gives "m" as a function of "h". Then find the minimum mirror length required for a person who is 66 inches tall.
*I think I need to use the direct variation equation "y=ax" and I was thinking the linear equation might look like this: f(h)=m, but I don't know the rest. Thank you so much!!!!!!
Click here to see answer by richard1234(7193)

Question 389669: The weight W of an object is directly proportional to its weight B on earth. A man who weighs 118.75 kg on Earth weights 47.5 kg on mars. Find the weight of a man on Mars if he weighs 98 kg.
Click here to see answer by ewatrrr(24785)

Question 389826: a map has a scale of 1 centimeter:120 kilometers. Use the given actual distance to find the distance on the map. Actual distance = 60km
Click here to see answer by mananth(16946)

Question 389839: The amounts of pollutants A entering the atmosphere is directly proportional to the population P living in an area. If 25000 tons of pollutant enter the atmosphere in an with a population of 17750, how many tons of pollutants enter the atmosphere in manila with a population of 2450500?
Click here to see answer by mananth(16946)

Question 390206: Can you please help me with this?

Van Gogh�s painting Starry Night measures 92 cm long by 73 cm high. You buy a poster that shows an enlargement of the painting. The poster measures 120 cm long by 100 cm high. Is the poster an accurate representation of the painting?
Click here to see answer by solver91311(24713)

Question 390444: A farmer who is 72 inches tall is standing beside a silo that has a height of 140 feet. The length of the silo's shadow is 31.5 feet. What is the length of the farmer's shadow?
Really appreciate your help on this one.
Click here to see answer by rfer(16322)

Question 390502: A basketball player made 36 free throws in 16 games. find the ratio of free throws to games
Click here to see answer by edjones(8007)

Question 390669: 60% of 60 is what number?
Click here to see answer by checkley79(3341)

Question 390717: What is the proportion of 300 out of 8
Click here to see answer by checkley79(3341)

Question 390772: a/40=30/100
i tried and i got 12. i dont know if its the right answer can you explain it to me?
Click here to see answer by stanbon(75887)

Question 390900: if a,b,c are in continued proportion, prove that:
(a^2+b^2+c^3)/(a+b+c)=a-b+c
and hence find three numbers in continued proportion so that their sum is 14 and the sum of their squares is 84

Click here to see answer by robertb(5830)

Question 390892: "If the 481 children's books represent 13% of the books in the library, how many total books are in the library?"
Use a percent equation and Use a proportion

Click here to see answer by robertb(5830)

Question 390893: Jeremy bought a souvenir while on vacation. The item cost $22.00, but the otal bill was $23.43, What percent was the sales tax?
Use a percent equation and Use a proportion
Click here to see answer by robertb(5830)

Question 391167: x-7=2x-6
Click here to see answer by haileytucki(390)

Question 391230: 535 is what percent of 825
Click here to see answer by rfer(16322)

Question 391395: x2+4
Click here to see answer by solver91311(24713)

Question 391414: does this have a solution?
A/48=2/6
Click here to see answer by solver91311(24713)

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