A certain number of men complete a piece of work in 60 days. if there were 8 men more, the work could be finished in 10 days less. How many men were there originally?
answer:
let the number of men originally be "x"
therefore x = (x + 8) x 50/60
or, 60x = 50x + 400
or 10 x = 400
or x = 40
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