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ATQ,
Aman's work rate: 1/20 (since he finishes the work in 20 days). Bittu's work rate: 1/30 (since he finishes the work in 30 days). Chintu's work rate: 1/60 (since he finishes the work in 60 days).
Work done in a 3-day cycle: Days 1 and 2: Only Aman works, completing 1/10 of the work in 2 days. Day 3: Aman, Bittu, and Chintu work together, completing 1/10 of the work.
So, in each 3-day cycle, they complete 2/10 =1/5 of the work.
Total time = To complete the entire work, it will take 5 cycles (since = 1/(1/5) = 5
Each cycle takes 3 days, so the total time is 5×3 = 15 days.
It will take 15 days for the work to be completed.
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