数学题：王老师用一些钱给学生买奖品，单买钢笔可买8支，单买练习本可买16本，王老师买了5支钢笔，剩下的钱可买多少本练习本？

数学题解答：这题是一道变相的工程问题，可以把王老师的钱看作“１”，那么每支钢笔的钱就是这些钱的1/8，每本本子就是这些钱的1/16。

王老师先买了5支钢笔，那么就用了：1/8 ×5 = 5/8，还剩下1 – 5/8 =3/8。

可以买的练习本有：3/8 ÷ 1/16 = 6（本）

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