2/3X= 12

X= 18

[2] solutions; 2/5+20%X=5

0.2X=5-0.4

X=23

[3] 1/4(8×60%- 1%÷ 1/8)

= 1/4×(8×0.6-0.0 1×8)

=2×(0.6-0.0 1)

= 1. 18