Question

A survey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand X aspirin. How many doctors use brand X aspirin?

Answer 1

This is a proportion problem that involves cross-multiplication
Set your problem up like so:
$\frac{x}{2,000}$ = $\frac{3}{5}$

Now cross multiply
2,000 x 3 = 6,000
now you're left with 5x = 6,000
Now divide by 5 on both sides
Answer is 1,200