30%x=120 x=120÷30%=120x100/30=400
x-60%x=160 40%x=160 x=160÷40%=160x100/40=400
120x-20x=40 100x=40 x=40÷100=40%
x+1/5x=240 6/5x=240 x=240÷6/5=240x5/6=200
50%x-33%x=34 17%x=34 x=34÷17%=34x100/17=200
x+130%x=460 230%x=460 x=460÷230%=460x100/230=200