Question
If the efficiency ratio of A, B, and C is 7:9:11, and B and
C together can finish a task in 10 days, then how much time will A and B need to complete it?Solution
ATQ,
Let efficiencies of A, B, and C be 7x, 9x, and 11x units/day respectively.
Total work = (9x + 11x) × 10 = 200x units
Required time = 200x ÷ (7x + 9x) = 200x ÷ 16x = 12.5 days
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