Question

I can mow 2/5 acres an hour. If my yard is 2 acres how many hours will it take me to complete it?

Answer 1

Denote time for which you need to process 2 acres by x. Compose the ratio and solve it.

$2/5 \, acre - 1\, hour, \\ 2\, acres- x\, hours.\\ \frac{2x}{5}= 2;\\ x=2÷\frac{2}{5};\\x = 5\, (hours)$