1.

A alone can complete a work in 25 days while B can complete the same work in 20 days. They worked together for 5 days and then A left. In how many days the remaining work will be completed?1). 10 days2). 11 days3). 9 days4). 12 days

Answer»

One DAY’s WORK DONE by A = 1/25

One day’s work done by B = 1/20

Work done by (A + B) TOGETHER in 1 day = 1/25 + 1/20 = 9/100

So, Work done by (A + B) together in 5 days = 5 × 9/100 = 45/100

Remaining work = 1 – 45/100 = 55/100

1 work completed by B = 20 days

Hence, 55/100 part of work completed by B = 20 × 55/100 = 11 days


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