100
解:2/5x=1/4(x+60) 2/5x=1/4x+15 2/5x-1/4x=15 3/20x=15 x=15*20/3 x=100
x-3/5x=(x+60)×(1-3/4)解(1-3/5)x=(x+60)×1/42x/5=x/4+158x=5x+3008x-5x=3003x=300解得x=300/3=100