48*(7/12+5/600）/(2/3)
=48*(7/12+5/600）*3/2
=24*(7/12+5/600）*3
=42+360/600
=42.6
1/8+(1/8+1/30)*15
=(15/8+1/8+1/30)*15
=(2+1/30)*15
=30.5