A, Band C can do a piece of work in 11 days, 5 days and 55 days respectively, working alone. How soon can the work be done if A is assisted by Band C on alternate days? Pick: A) 5 days B) 8 days C) 9 days D) 10 days E) 11 days
(5 days+B)'s 1 day's work = 1/11+1/5 = 16/55   (5 days+C)'s 1 day's work = 1/11+1/55 = 6/55   work done in 2 day's = 16/55+6/55 = 2/5   2/5th work done in 2 days   work done= 5/2*2= 
<gadget id="calculator">5/2*2</gadget>
<output>5</output>
5 days   5 daysNSWER:5 days
<result>A</result>
A, Band C can do a piece of work in 11 days, 5 days and 55 days respectively, working alone. How soon can the work be done if A is assisted by Band C on alternate days?