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" If 4 men can do a piece of work in 8 days, how many men would it take to do the same work in 4 days ? 20. "
A Mental Arithmetic - Σελίδα 71
των William James Milne - 1897 - 176 σελίδες
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...hour, how much remains in the cistern in an hour 1 and in how many hours will the cistern be filled ? 19. If 4 men can do a piece of work in 8 days, how many men would it take to do the same work in 4 days 1 20. If 6 men can do a piece of work in 9...

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The Illustrative Practical Arithmetic by a Natural Method with Dictation ...

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