Question

x 40x=21,x-15=51,4分之3x-2分之1x=9分之1

Answer 1

x+40%x=21

1.4x=21

x=15

x-15%x=51

0.85x=51

x=60

4分之3x-2分之1x=9分之100

4分之x=9分之100

x=9分之400