20只鸽子飞回6个鸽舍,至少有 只鸽子要飞进同一个鸽舍里.
24÷ = :16=0.375== %.
:24=== ÷16= %
= :35=5:7= ÷21=.
== ÷20=6: = %= 折.
÷15=0.8== %= 折.