Question

a speed boat Factory can produce 12 boats in 8 days how many days will it take to factory to produce 30 speed boats

Answer 1

Assuming the factory is working at the same production rate, the number of days is proportional to the number of boats.

... 8 days/(12 boats) = x days/(30 boats)

Multiply by 30 boats, and you get

... x days = 8 days×30/12 = 20 days

It will take the factory 20 days to produce 30 boats.