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Página 61 - A can do a piece of work in 3 days, B in 4 days, and C in 5 days. How much can each do in a day ? How much can all do in a day?
Página 126 - The Greatest Common Divisor of two or more numbers is the greatest number that will exactly divide each of them.
Página 55 - C in ten days ; how many days would it take each to perform the same work alone ? Ans.
Página 117 - If a staff, 5f ft. in length, cast a shadow of 6 feet, how high is that steeple whose shadow measures 153 feet ? Ans. 144£ feet. 14. If 16 men finish a piece of work in...