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Correct Answer: 12

Work done = 1/3

Remaining work = (1−1/3)=(3−1/3)=23

Let the number of more men to be employed be x.

More work, More men (Direct proportion)

More days, Less men (Indirect proportion)

Work 1/3 : 2/3

:: 20 : (20+x)

Days 25 : 20

Therefore, 1/3×25×(20+x)=2/3×20×20

=> (20+x)=800/25=32

Therefore, x = 32 – 20 = 12