A alone can complete a work in 16 days and B alone can complete in 12 days. Starting with A they work on alternate days. The total work will be completed in?
Options: A) 12 B) 13 C) 13 5/7 D) 13 ¾ E) None of these
Explanation:   (A+B)’s 2 day work = 1/16 + 1/12 = 7/18   work done in 6 pairs of days=7/48 x 6 = 7/8   remaining work = 1/8   work done by A on 13th day =1/16 remaining work = 1/16   on 14th day its B turn 1/12 work is done by B in 1 day 1/16 work is done by B in 12 x 1/16 = 3/4 day   total time taken =13 ¾ days   Answer: Option 13 ¾
<result>D</result>
A alone can complete a work in 16 days and B alone can complete in 12 days. Starting with A they work on alternate days. The total work will be completed in?