Book Maths Puzzle

x men working x hours per day can do x units of a work in x days. How much work can be completed by y men working y hours per day in y days?

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Book Other Question

If the price of 357 apples is Rs.1517.25, what will be the approximate price of 49 dozens of such apples? A contract is to be completed in 56 days if 104 persons work, each working at 8 hours a day. After 30 days, 2/5 of the work is completed. How many additional persons should be deployed so that the work will be completed in the scheduled time,each persons now working 9 hours a day.