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

`\bf \cfrac{\textit{use X aspirin}}{\textit{don't use X aspirin}}\quad 3:5\qquad \cfrac{3}{5}\qquad \cfrac{3\cdot (2000)/(3+5)}{5\cdot (2000)/(3+5)}\implies \cfrac{3\cdot 250}{5\cdot 250}\implies \cfrac{750}{1250}`