10 workers working for 6 days can complete 5 copies of a book. If there are 8
workers working to complete 4 copies of the book, how many days will it take!
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6 days
Explanation
10 workers 5 copies 6 days
" " 1 " 6/5 "
1 " 1 " 6/5×10
8 " 4 " 6/5×10/8
=6 days
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