X can complete a certain work in the same time in which Y and Z together can do it . If X and Y together can finish it in 10 days and Z alone in 15 days , then Y alone can do it in ?

X can complete a certain work in the same time in which Y and Z together can do it . If X and Y together can finish it in 10 days and Z alone in 15 days , then Y alone can do it in ? Correct Answer 20 days

1x = 1y + 1zand 1x + 1y = 110...(ii) ⇒1x - 1y = 115.. (i) (i) - (ii) ⇒ - 2y = 115 - 110⇒ - 2y = 2 - 330⇒ - 2y = - 130⇒1y = 160.'. y = 60 days 
Bissoy MCQ

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