20 men working 8 hours per day can complete a piece of work

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20 men working 8 hours per day can complete a piece of work in 21 days. How many hours per day must 48 men work to complete the same job in 7 days?

1. 12
2. 20
3. 10
4. 15

Correct Option: C

⇒ 48 × 7 × x = 20 × 21 × 8

⇒ x =	20 × 21 × 8	= 10 days
	48 × 7