Q&A for How to Work Out a Fraction of an Amount

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  • Question
    How much rope do I use if I have 9 1/4 meters of rope and use 2/7?
    Community Answer
    This problem is essentially asking, "What is 2/7 of 9 1/4?" So, you will multiply the two fractions to get your answer. For instructions on how to multiply two fractions, you can read the following article:http://www.wikihow.com/Multiply-Mixed-Numbers
  • Question
    Nine trucks are equal in weight to six trucks and four sedans. What fraction of the weight of a truck is the weight of a sedan?
    Community Answer
    You can set up the equation like this: 9x = 6x + 4y, where x = the weight of a truck, and y = the weight of a sedan. Since they want to know what fraction of a truck's weight (x) equals the weight of a sedan (y), you need to solve for y. 9x = 6x + 4y 3x = 4y 3/4x = y. So, the weight of a sedan is 3/4 the weight of a truck.
  • Question
    What is 3 quarters of 40?
    Community Answer
    3 quarters is the same as 3/4. So this is a multiplication problem: 3/4 x 40 = 3/4 x 40/1 = 120/4 = 30
  • Question
    1/3 of the barn is chickens and the rest are pigs. There are 20 legs in total. How many pigs are there?
    Community Answer
    The inclination is probably to multiply 20 by 1/3, because if 1/3 of the animals are chickens, then 1/3 of the legs must be chicken legs. This doesn't work, however, because chickens and cows have a different number of legs. So you can't solve this problem simply by multiplying the fraction and the whole number. The easiest way to solve this problem is to think about it logically. For every 1 chicken in the barn, there are 2 cows. That means, for every 2 chicken legs, there are 8 cow legs. So you can set up a table, and keep track of the legs until you get to 20 legs: 1 chicken/2 cows = 2 legs/8 legs = 10 legs 2 chickens/4 cows = 4 legs/16 legs = 20 legs. So there are 2 chickens and 4 cows.
  • Question
    How do I work out a sum of two fractions?
    Community Answer
    For complete instructions on how to add fractions, you can read the following article: http://www.wikihow.com/Add-Fractions
  • Question
    If 2/5 of a number is 16, what is that number?
    Community Answer
    You need to set up an algebraic equation. Let the missing number be x. The question is stating, "2/5 of what number = 16?" So your equation will be (2/5)x = 16. So to get the answer, you need to divide 16 by 2/5. (For complete instructions on how to divide by a fraction, you can read the following article: http://www.wikihow.com/Divide-Fractions-by-Fractions) 16 divided by 2/5 = 40.
  • Question
    If Sarah has 12 gel pens and she gives 3/4 of them away, how many does she give away?
    Community Answer
    The question is essentially asking, "What is 3/4 of 12?" So you will multiply the fraction and the whole number: 3/4 x 12/1 = 36/4 = 9.
  • Question
    How many 3/5 m strips of ribbon can I cut from a 2 m length of ribbon?
    Donagan
    Top Answerer
    Divide 2 by 3/5.
  • Question
    How do I write 168 hours minus 6 as a fraction?
    Community Answer
    Calculate 168 - 6 = 162. Place this difference over the original number to make a fraction: 162/168. Then you need to reduce your fraction by finding the greatest factor common to the numerator and the denominator. (For complete instructions on how to reduce a fraction, read the following article: http://www.wikihow.com/Reduce-Fractions.) The greatest common factor is 6. So when you divide the numerator and the denominator by 6, you get the fraction 27/28.
  • Question
    Jane has 1/4 salary compared to Tom. What does it mean?
    Donagan
    Top Answerer
    It means that Tom's salary is four times larger than Jane's.
  • Question
    How do I work out 1/5 of 18.5?
    Donagan
    Top Answerer
    Multiply 18.5 by 0.2.
  • Question
    In a fish bowl there were 12 fish, some little, others big. The big fish each eat 2 little fish so that all the little fish were gone. How many fish remain in the fish bowl?
    Donagan
    Top Answerer
    If each big fish is able to eat two small fish, that means there were twice as many little fish as big fish to begin with. Let x equal the number of big fish. Then (x + 2x) = 3x = 12. So x = 4.
  • Question
    How do I work out 13/12 - 2/3?
    Community Answer
    For complete instructions on how to subtract fractions, you can read the following article: http://www.wikihow.com/Subtract-Fractions
  • Question
    How do you work out 2% of an amount?
    Community Answer
    You can turn the percentage into a fraction and then multiply. "Two percent" means "two hundreds," so the fraction is 2/100. So you would multiply 2/100 (or 1/50) times the amount.
  • Question
    What is the fraction of 2 out of 40?
    Community Answer
    "2 out of 40" indicates that 2 is the numerator, and 40 is the denominator. So the fraction is 2/40, which simplifies to 1/20.
  • Question
    How do I know which fractions are bigger?
    Community Answer
    For complete instructions on how to compare fractions, you can read the following article: http://www.wikihow.com/Compare-Fractions
  • Question
    What fraction of 368,400 is 331,560?
    Community Answer
    For this problem you need to create a fraction and reduce it. The phrase "fraction of x" tells you that your denominator is 369,400. So your fraction is 331,560/368,400. From here you need to reduce the fraction by finding the greatest factor common to the numerator and denominator. (For complete instructions on how to reduce a fraction, you can read the following article: http://www.wikihow.com/Reduce-Fractions) This greatest common factor is 36,840. So, dividing the numerator and denominator by this factor, you get the fraction 9/10.
  • Question
    How do I find the percentage left when removing two items from eight?
    Community Answer
    First you need to find the difference when you remove the two items. Then find the percentage left by dividing the amount left over by 8.
  • Question
    How can I work out 1/5 of 40 = 2/5 of?
    Community Answer
    You need to set up a an equation using the variable x for the missing number. "Of" means to multiply, so the equation will look like this: (1/5)40 = (2/5)x 8 = (2/5)x 20 = x
  • Question
    How can I find 3/8% of 800?
    Donagan
    Top Answerer
    Convert 3/8% to a decimal, and multiply it by 800. 3/8% means 3/8 of 1% or (3/8)(1%) or (3/8)(.01). That's (0.375)(.01) = 0.00375. So multiply 800 by 0.00375. That equals 3. So 3/8% of 800 is 3. (Another way to think of this is: 1% of 800 is 8. 3/8% is 3/8 of 1%, and 3/8 of 8 is 3.)
  • Question
    14 1/3 cream cakes were eaten for dessert. How many sixths of cream cake is this in total?
    Donagan
    Top Answerer
    First find out how many thirds that is: 14 1/3 = [(14 x 3) + 1] thirds, or 43 thirds, which is (2 x 43) or 86 sixths.
  • Question
    If a guava is comprised of 12 slices, what is the fraction represented by 1 slice?
    Donagan
    Top Answerer
    One slice is 1/12 of the guava.
  • Question
    If 2/9 of my money is 270, how much is 3/4 of it?
    Donagan
    Top Answerer
    Your total money is (270)(9/2) = 1215. 3/4 of 1215 is 911.25.
  • Question
    Solve 14+1/4 of 20-7.
    Donagan
    Top Answerer
    ¼ of 20 is 5. 14 + 5 - 7 = 12.
  • Question
    How can I convert fractions to percentage?
    Donagan
    Top Answerer
    Divide the numerator by the denominator. Multiply that number by 100, and place a percent sign to the right of the product. For example, to convert ¾ to a percentage, divide 3 by 4. That's 0.75. Multiply by 100 and add the percent sign: 75%. It works for improper fractions, too. Convert 12/10 to a percentage: 12 divided by 10 is 1.2. Multiply by 100 and add the sign: 120%.
  • Question
    Jimena eats 50% of a cake then eats another 3/4. How much did she eat all together?
    Donagan
    Top Answerer
    Let's assume that she ate 50% of the cake and then ate ¾ of the other half. ¾ of a half is (¾)(½) = 3/8. The first half was 4/8. 4/8 + 3/8 = 7/8.
  • Question
    Gordon has 82 for Lab work, 91 for quizzes,78 for tests and 81 for the final exam. What grade will Gordon get for the course?
    Donagan
    Top Answerer
    If all four components carry an equal weight, add the four numbers together, and divide by 4. (82 + 91 + 78 + 81) / 4 = 83. Looks like a B. It's more complicated if all four components do not carry the same weight.
  • Question
    What is 5/7 of 234?
    Community Answer
    Multiply 234 by 5/7. In other words, multiply 234 by 5 and then divide the product by 7.
  • Question
    Some buns were left in the kitchen and the worker ate 24 of them, which is 3/5 of the batch. How many were there before the workers got to them?
    I_l1ke_gam3s
    Community Answer
    You would divide 24 by 3/5. 24 / 3/5 = 24 (5/3) = 120/3 = 40, therefore, there were 40 buns before.
  • Question
    Can someone find 1/6 of 50?
    Community Answer
    1/6 of 50 = 1/6(50). 1/6(50) = 50/6 = 25/3 or 8 1/3.
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