A man, a woman and a boy can complete a job in 3, 4 and 12 days respectively. How many boys must assist 1 man and 1 woman to complete the job in 1/4 of a day? Choose one:
A) 22
B) 77
C) 12
D) 41
E) 76
(1 man + 1 woman)'s 1 day work = (1/3 + 1/4) = 7/12 Work done by 1 man and 1 woman in 1/4 day = (7/12 * 1/4) = 7/48   Remaining work = (1 - 7/48) = 41/48   Work done by 1 boy in 1/4 day = ( 1/12 * 1/4) = 1/48   Number of boys required = 41/48 * 41 = 41.   Answer: 41
<result>D</result>
A man, a woman and a boy can complete a job in 3, 4 and 12 days respectively. How many boys must assist 1 man and 1 woman to complete the job in 1/4 of a day?