8 men working 9 hours a day complete a piece of work in 20 days. In how many days can 7 men working for 10 hours a day complete the same piece of work?

1
\(18\frac{3}{7}\)
2
\(18\frac{4}{7}\)
3
\(20\frac{3}{7}\)
4
\(20\frac{4}{7}\)

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