P can do a piece of work in 18 days and Q can do in 22 days, with the help of C, they finish the work in 6 days. How long will it take R to finish the work?
Choose the correct choice from the following choices
A) 17days  B) 18days  C) 16 ½ days  D) 17 ½ days  E) 19 days
Explanation:   (P+Q) 1 day work = 1/18 + 1/22 = 7/66   (P+Q+R) 1 day work = 1/6   R 1 day work =1/6 – 7/66 = 2/33   R can do piece of work in 16 ½ days   Answer: Option 16 ½ days
<result>C</result>
P can do a piece of work in 18 days and Q can do in 22 days, with the help of C, they finish the work in 6 days. How long will it take R to finish the work?