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A shopkeeper allows 18% discount on the marked price of an article and still makes a profit of 25%. If he gains ₹106.6 on the sale of the article, then what is the marked price of the article?
Two pipes P and Q, when opened alone can fill the tank in 20 and 30 hours respectively. If both pipes are opened together, then in how many hours will the tank be filled?
P, Q and R together can do a piece of work in 56 days. P and Q together can do one-fourth as much work as R alone. In how many days can P and Q together complete the entire work?