math

a framer divides his herd of cows anong his 4 sons, one get 1/2, second get 1/4, 3rd gets 1/5 and the 4th get 7. how many cows are in the herd?

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asked by lily
  1. x/2 + x/4 + x/5 + 7 = x

    multiply each term by 20 and solve, it's easy from there.

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    posted by Reiny
  2. thank you for your help.i got 26 as the answer. i am not sure if this is correct. i am only in the 7th grade and this is the first time i am doing this kind of problem. could you please explain a little more.

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    posted by lily
  3. ok, let's do it without algebra

    so far he has given away 1/2, 1/4 and 1/5 of the herd
    1/2 + 1/4 + 1/5
    = 10/20 + 5/20 + 4/20
    = 19/20 of the herd, leaving 1/20

    but it said the 4th son get 7 cows, so he must have received 1/20
    then if 1/20 equals 7 then
    20/20 , or the whole herd, must have been 20x7 or 140 cows

    check:
    1/2 of 140 = 70
    1/4 of 140 = 35
    1/5 of 140 = 28
    sum of 70+35+28+7 = 140

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    posted by Reiny
  4. oooooooooooooooo that makes alot more sense, thank you!

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    posted by lily

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