Question

twenty seven out of forty dentists recommended a certain whitener for teeth. if 1080 dentists recommended the whitener in the survey, how many dentists were surveyed?

Answer 1

1,600 dentists were surveyed in total.

Explanation:

We can set up a proportion for this problem:

`(27)/(40) = (1080)/(x)\\\\\\`

Now we can cross multiply:

`27*x = 1080*40\\\\27x = 43,200\\\\27x/27 = 43,200/27\\\\x = 1,600`

1,600 dentists were surveyed in total.