Question

Riya and priya can do a piece of work in 9 days and 12 days respectively. If they work for a day alternately and Riya begins to work first,in how many days the work will be completed?

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Answer 1

Answer:

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Answer 2

(riya+priya)'s 2 days work = (1/9 + 1/12)= 7/36

(riya+priya)'s 10 days work = 10/2 *7/36 = 35/36

remaining work (1- 35/36 = 1/36) has to be done by Riya on 11th day,

its done by riya in 9* 1/36 = 1/4 day

total time = 10 +1/4 = 41/4 days