Question : 10 men can do work in 25 days. After 12 days of work, 3 more men were engaged to finish the work. The number of days required to complete the remaining work is:
Option 1: 10
Option 2: 8
Option 3: 6
Option 4: 12
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Correct Answer: 10
Solution : Given: 10 men can do a work in 25 days. After 12 days of work, 3 more men were engaged to finish the work. Here, $M_1=10,M_2=10+3=13,D_1=25-12=13$ We know, $M_1D_1= M_2D_2$ ⇒ 10 × 13 = 13 × D 2 $\therefore$ D 2 = 10 days Hence, the correct answer is 10.
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