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P,Q and R can do a piece of work in 18 days, 36 days and 54 day respectively. They start the work together but Q and R leave 1 day and 5 days respectively, before the completion of work. In how many days has the work been completed ?A. 10B. 11C. `10(7)/(11)`D. `10(9)/(11)` |
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Answer» Correct Answer - B (i) Let P work for x days, then Q work for (x-1) days and R work for (x-5) days. (ii) let the number of days P worked be x.Therefore Q worked for (x-1) days and R worked for (x-5) days. (iii) `(x)/(18)+(x-1)/(36)+(x-5)/(54)=1`.Solve for x. |
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