A man, a woman and a boy can complete a work in 3, 4 and 12 days, respectively. How many boys must assist one man and one woman to complete the same work in one day?
A. 5
B. 7
C. 4
D. 9
Answer: Option A
Solution (By Examveda Team)
Total work for 1Men + 1Women + xBoy in 1 day = 12
⇒ 1 × 4 + 1 × 3 + 1 × x = 12
⇒ x = 12 - 7
⇒ x = 5
This Question Belongs to Arithmetic Ability >> Time And Work
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