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6 tractors can plow a cornfield in 8 hrs. How many hours will it take 4 tractors to plow the cornfield? Thanks? - tractors plowing

With cross-multiplication to solve this problem.

Tractor 6 / 8 hours = 4 wheels per hour

rewritten in order to understand it easier:

6 / 8 = 4 / x

Now multiply the cross:

6x = 8 * 4

6x = 32

the last thing you need to do is solve for x, with which you make your own =) too.