Prof. Giray Okten

Monday, February 16, 2009

Week 2 - Problem 2

There were 60 birds on three trees. At 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 tree. After that, it turned out that the number of birds on each tree was the same. How many birds were there on the second tree in the beginning?

A) 26 B) 24 C) 22 D) 21 E) 20

4 comments:

  1. howd u get that? 60 initial birds - 6 - 8 - 4 = 42 birds now / 3 trees = 13 birds per tree now + 8 initial birds on tree #2 = 21 initial birds (D).

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  2. abarnstable - your method is correct, but 42/3 is 14, not 13. So, the answer is (C)22

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