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It takes 3 salesmen 8 days to sell 5000 boxes of soap
It takes 5 salesmen ? days to sell 5000 boxes of soap

For 3 to be 5 we need to multiply it by  \frac{5}{3}
Since the ratio in salesmen and the number of days is indirect multiply 8 by  \frac{3}{5}
8* \frac{3}{5} =4 \frac{4}{5}

It will take them  4\frac{4}{5} days
1 5 1