B=16*2/0.4=80
x=6*30/5=36
a=13*4/0.8=65
x=3*16/8=6
x=42*63/126=21
x=(3*2 1/7) /(5/7)=9
x=5*14/35=2
x=45*28/20=63
x=14*26/52=7
x=120*8/24=40
x=50*44/88=25
x=38*325/65=190
x=15*68/25=40.8
x=35*24/8=105
x=(5.4*1.6) / (5*1.2)=1.44
x=5*2.5/0.5 +2=27
x=(12.3*56) /(6*0.8)=143.5
x=(20*2.2)/(11*2)=2