数学题：养鸡场将一批鸡蛋装箱，若用a型箱，正好要装800箱，但a型箱数量不足，全部改用B型箱装。已知每个B型箱的容量是A型箱的五分之四，需要B型箱多少个？

数学题解答：

在鸡蛋总量一定的情况下，箱数与每箱的容量成反比例关系，即每箱的容量与箱数的乘积一定。

把Ａ型箱容量看作“１”，则Ｂ型箱的容量为　4/5。

设需Ｂ型箱Ｘ个。

4/5 X=1×800

X=800× 5/4

X=1000

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