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" At a siege it was found that a certain length of trench could be dug by the soldiers and navvies in 4 days, but that when only half the navvies were present it required 7 days to dig the same length of trench. What proportion of the work was done by the... "
Arithmetic for the use of schools. [3 pt. in 1]. - Σελίδα 82
των Richard Dunkley Beasley - 1867
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