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Job takes 60 mandays + 80 boy days or 52 mandays + 96 boydays.

Thus 8 man days = 16 boydays so 2 boydays = 1 manday.

This means that 7 mandays and 10 boydays is equivalent to 12 mandays.

The job requires 60 + 80/2 ie 100 mandays so it would require 8 and a third days.

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Q: If 12 men and 16 boys can do a work in 5 days and 13 men and 24 boys can do it in 4 days how long will 7 men and 10 boys take to do it?
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