1a 2xX=18 X=9
b 4xX=32 X=8
c 6xX=42 X=7
d 3xX=36 X=13

2a Xx10=110 X=11
bXx20=200 X=20
c Xx15=45 X=3
d Xx40=800 X=80

3a 30:X=5 X=6
b 28:X=4 X=7
c 63:X=9 X=7
d 100:X=5 X=20

4a X:2=12 X=24
b X:5=9 X=45
c X:4=11 X=44
d X:3=12 X=36

5a Xx30=180 X=6
b Xx50=1000 X=100
c 64:X=4 X=
d