Q324
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
AnswerB.
7
C.
4
D.
9
Answer: Option A
Solution
Answer: Option A
Solution:
Total work for 1Men + 1Women + xBoy in 1 day = 12
⇒ 1 × 4 + 1 × 3 + 1 × x = 12
⇒ x = 12 - 7
⇒ x = 5