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" If 180 men, in 6 days of 10 hours each, can dig a trench 200 yards long, 3 wide, and 2 deep ; in how many days, of 8 hoars long, will 100 men dig a trench of 360 yards long, 4 wide, and 3 deep ? Ans. "
Arithmetic, for use in schools - Σελίδα 251
των John Barter (of the science and art coll, Plymouth.) - 1877
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