Question
Efficiencies of workers A, B, and C are in the ratio 5:7:8
respectively. If B and C can do the work in 9 days, then in how many days can A and B finish the work together?Solution
ATQ,
Let efficiencies of A, B, and C be 5x, 7x, and 8x units/day respectively.
Total work = (7x + 8x) × 9 = 135x units
Required time = 135x ÷ (5x + 7x) = 135x ÷ 12x = 11.25 days
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