Question

1.商场出售一件毛衣,打九折后便宜了50元,求这件毛衣原价?

Answer 1

1. x(1-90%)=50,x=500

2. x+y+z=1360

x(1-60%)=(y-70)=z(1+25%)

x=750,y=370,z=240

3.120x(1+30%)=156

4. 25 50 300