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ATQ,
Let total work = 105 units {LCM of 21 and 35}
Efficiency of (Aman + Bhuvan) = 105/21 = 5 units/day
Efficiency of Bhuvan = 105/35 = 3 units/day
Therefore, efficiency of Aman = 5 – 3 = 2 units/day
Efficiency of Chintu = 2 × (3/2) = 3 units/day
Required ratio = 3 : 3 = 1 : 1
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