Subject: General Aptitude · Chapter: Time and Work · Exam: 2006 · Marks: · Difficulty:
A, B and C can separately do a work in 12, 15 and 20 days respectively. They started to work together but C left after 2 days. The remaining work will be finished in
(a)4 days
(b)5 days
(c)6 days
(d)15 days
Answer
Answer (as printed): A
Explanation
(A + B + C)’s 1 day's work = + + = = . 12 15 20 60 5 1 2 (A + B + C)’s 2 days’ work = × 2 = . 5 5 2 3 Remaining work = 1 – = . 5 5 1 1 9 3 (A + B)’s 1 day’s work = + = = . 12 15 60 20 3 Now, work is done by A and B in 1 day. 20 3 20 3 \ work will be done by A and B in × = 4 day 5 3 5 1 1 5 1
Explanation as extracted from the printed page; notation may be imperfect.