0.1x+0.3y=0.15(x+y)0.1x+0.3y+0.2×300=0.18×(x+y+300)x=?y=?

Question

0.1x+0.3y = 0.15(x+y) 0.1x+0.3y+0.2×300 = 0.18×(x+y+300) x=?y=?

Answer 1

根据0.1x+0.3y+0.2×300 = 0.18×(x+y+300)化简得0.1x+0.3y+60=0.18×(x+y）+54
又0.1x+0.3y = 0.15(x+y)
所以0.15(x+y)+60=0.18×(x+y）+54
化简得（x+y)=200
由0.1x+0.3y = 0.15(x+y)得x=3y
所以解得x=150,y=50