x-60%x=120x40%(1-0.6)x=480.4x=48x=48÷0.4x=120
解:40%x=120×40% x=120×40%÷40% x=120
x-60%x=120x40%40%x=120x40%x=120
30%x=120 30x=12000 x=400 x-60%x=160 40%x=160 40x=16000 x=解:30%x=120. x=400 x-60%x=160, x=400 120x-20x=40,
120