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math

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word problem:

Q1.there were 60 birds at three treesin some moment 6 birds flew away from the first tree,8 birds flew away from the second tree, and 4 birds flew away from the third tre. then there were same number of birds at each of the three trees. How many birds were there at the second tree at the begning?

(a)24 (b)22 (c) 21 (d)20

thanks,
Rosalia

  • math -

    T1: x
    T2: y
    T3: 60-x-y

    after fly-away:
    T1: x-6
    T2: y-8
    T3: 60-x-y - 4

    so now x-6 = y-4 or y = x+2
    and x-6 = 60-x-y - 4
    2x + y = 62
    sub in y=x+2
    2x + (x+2) = 62
    x = 20
    then y=22

    so T1 = 20
    T2 = 22
    T3 = 60-20-22 = 18

    (nice little morning work-out)

  • small typo - math -

    line
    << so now x-6 = y-4 or y = x+2 >>

    should of course say

    so now x-6 = y-8 or y = x+2

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