1/4x + 1/8(120-x) =20

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1/4x + 1/8(120-x) =20

1/4x + 1/8(120-x) =20
1/4x + 1/8(120-x) =20

1/4x + 1/8(120-x) =20
1/4x + 1/8(120-x) = 20
两边同乘以 8 得
2x + 120 - x = 160
x = 40


1/4x+15-1/8x=20
1/8x=5
x=40