4.there are some chickens and rabbits in a cage.3份之1of the rabbits were born to have 3legs. if the total number of heads is 35and the total number of heads is35 and the total number of leg is90,find the number of
A)chickens
B)rabbits whith 4legs
數學數學~(幫下我~唔該)
2007-01-01 5:30 am
回答 (1)
2007-01-01 5:44 am
✔ 最佳答案
A)Let x be the number of chickens, y be the number of rabbits.
x = 35 - y
90 = 2(35 - y) + 4y(2/3) + 3y(1/3)
90 = 70 - 2y + (8/3)y + y
20 = y(-2 + 8/3 + 1)
20 = y(8/3 - 1)
20 = (5/3)y
y = 20*3/5
y = 12
35 - 12
=23chickens
B)
12 - (12*1/3)
= 12 - 4
= 8
so（三點）there are 8 rabbits whith 4legs
註：ａ個題所有 / 係分數，
即 分子／分母
參考: 我做過，老師對過，一定ｏｋ
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