Given:
A can complete the work in 24 days.
A works for 21 days.
B completes the remaining work in 5 days.
Formula Used:
Work done = Time × Efficiency
Solution:
Let the efficiencies of A and B be A units/day and B units/day respectively.
Total work =
3A = 5B
Total work = 24A = = 120 units
A and B together finish the work in:
= = 15 days
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