(5/8) × 480 + (3/9) × 450 = (5/2) × ?
ATQ, (5/8) × 480 + (3/9) × 450 = (5/2) × ? (5 × 60) + (3 × 50) = 2.5 × ? ? = (300 + 150) ÷ 2.5 ? = 180
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