12米比( )少20% ( )比16少40%
问题描述:
12米比( )少20% ( )比16少40%
答
12米比( 15 )少20%
12÷(1-20%)
=12÷0.8
=15米
( 9.6 )比16少40%
16×(1-40%)
=16×60%
=9.6