若a:b=2:3,b:c=1:2,且a+b+c=66,则a=_.
问题描述:
若a:b=2:3,b:c=1:2,且a+b+c=66,则a=______.
答
a:b=2:3,
b:c=1:2=(1×3):(2×3)=3:6,
a:b:c=2:3:6,
66×
=12.2 2+3+6
故答案为:12.