1.

P and Q can complete a certain in 28 days and 56 days, respectively. P works for 7 days, and then Q joins P . In how many more days, can they complete the work ?A. 7B. 14C. 21D. 28

Answer» Correct Answer - B
(i) Fram the equation and solve.
(ii) P works for 7 days, remaining work `=1-(7)/(28)-(3)/(4)`
(ii) Let the required number of days =x
`:. (x)/(28)+(x)/(56)=(3)/(4)`.


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