#### Answer

45 employees exercise at least 3 times per week

#### Work Step by Step

Determine how many of the employees think it is a good idea to exercise regularly, then determine how many of those actually do exercise regularly.
$\frac{9}{10} = \frac{x}{300}$
$10x = 9\times300$
$\frac{10x}{10} = \frac{2700}{10}$
$x = 270$ think it is a good idea to exercise regularly
$\frac{1}{6} = \frac{x}{270}$
$6x = 1\times270$
$\frac{6x}{6} = \frac{270}{6}$
$x = 45$ exercise at least 3 times per week