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+1/8×120-1/8X=20
1/4X-1/8X+15=20
1/8X=5
X=40

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