The ratio of the efficiencies of A, B and C is 7 : 5 : 8. Working together, they can complete a piece of work in 42 days. B and C worked together for 21 days and the remaining work was completed by A alone. The whole work was completed in:
A. 96 days
B. 99 days
C. 102 days
D. 93 days
Answer: Option C
Solution (By Examveda Team)
A : B : C = 7 : 5 : 820 × 42 = 21(B + C) + A × D days
20 × 42 = 21 × 13 × 7 × D
120 = 39 + D
D = 81
21 days, worked already
Total = 21 + 81 = 102 days
This Question Belongs to Arithmetic Ability >> Time And Work
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