4/3a:b:7/5c=3:5:7,则a:b:c=( )
问题描述：
4/3a:b:7/5c=3:5:7,则a:b:c=( )
答
假设a=9
则4/3a=12
12:b=3/5 b=20
12:(7c/5)=3/7
7c/5=28
c=28*5/7=20
a:b:c=9:20:20