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Fifth grade questions Mathematical Olympiad

xl11131714552010-02-18 14:10:42 +0000 #1
2 trees down with a total of 25 birds, 5 birds flew from the first tree in the second tree, then flew a second 7, when the first tree in the small Bird is the second tree on the tree 2 times, and asked each of the first Each species of tree, bird How many?
lxzhtxh132010-02-18 14:13:00 +0000 #2
first tree X, the second tree the tree Y

X + Y = 25

X-5 = (Y +5-7) * 2

X = 17

Y = 8
liding2342010-02-18 14:43:42 +0000 #3
25-7 = 18 which is driven off after the seven remaining total of two birds in a tree

due to the first one is the second of two times the trees, so 18 divided by (1 +2) = 6 to get a second bird is now the number of trees to 6 +7-5 = 8, this is the second tree the beginning of the bird the number of

25-8 = 17, this is the first tree in the beginning the number of birds
yangpeiwei882010-02-18 15:20:17 +0000 #4
25-7 = 18 (only)

18 / 3 = 6 (only)

6 * 2 = 12 (only)

12 +5 = 17 (only)

6-5 +7 = 8 (only)

A: The first tree has 17 birds, the second tree, trees, 8 birds.
ice8506212010-02-18 15:35:45 +0000 #5
No. 1 17, the second tree 8

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