爷爷的年龄加上2,除以4,再减12,再乘5,正好是25岁,爷爷今年多少岁?

问题描述:

爷爷的年龄加上2,除以4,再减12,再乘5,正好是25岁,爷爷今年多少岁?

(25/5+12)*4-2
=(5+12)*4-2
=17*4-2
=68-2
=66