Question

In a survey, 9 out of 10 dentists recommend PurWhite toothpaste for their patients. If 80 dentists were surveyed, how many doctors recommend PurWhite toothpaste?

Answer 1

72 dentists

Explanation:

In this case, we can multiply 80 by 9/10 or .9 to get our answer.

If we were to multiply by 9/10 it would look like this:

`80 * (9)/(10) \\(720)/(10) = 72`

But, if we were to multiply by .90 (remember that 9/10 = .9) it would look like this:

`80(.90) = 72`

Therefore, if 9 out of 10 dentists recommended PurWhite toothpaste and 80 were surveyed then 72 out of the 80 would have recommended it.

I hope this helps!!

If you have any questions feel free to ask!

- Kay :)