若a/b=20,b/c=10,则(a+b)/(b/c)的值为?
问题描述：
若a/b=20,b/c=10,则(a+b)/(b/c)的值为?
答
若a/b=20,b/c=10,
则b=10c,a=20b=200c
(a+b)/(b/c)
=(200c+10c)/(10c/c)
=210c/10
=21c