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ATQ,
Let the total work be 42 units (LCM of 14 and 21)
Efficiency of Sneha = 42/14 = 3 units/day
Efficiency of Reena = 42/21 = 2 units/day
Total efficiency = 3 + 2 = 5 units/day
Required amount that Reena will get = 14,700 × (2/5) = Rs. 5,880
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