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If twelve men can dig a trench 15 yards long and 4 broad in 3 days of 12 hours each, in how many days of 9 hours each can 8 men dig a trench 20 yards long and 8 broad ? 22.
Arithmetic, for use in schools - Σελίδα 94
των John Barter (of the science and art coll, Plymouth.) - 1877
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