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The correct answer is A
Aamir is twice as efficient a worker as Bender and together they can complete a work in 42 days. In how many days will Aamir alone complete the same work?
. If 3 goats or 5 sheep can graze a field in 56 days, then in how many days can 6 goats and 10 sheep graze the same field?
X can do a piece of work in 25 days. He worked at it for 5 days and then Y finished it in 24 days. In how many days can X and Y together finish the work?