3:_=(12)20=24÷_=_%=六折.

问题描述:

3:______=

(12)
20
=24÷______=______%=六折.

六折=60%=

60
100
=
12
20
=
3
5
=3:5=3÷5=24÷40
故答案为:5,12,40,60.