Question

A survey indicated that 3 out of 5 doctors use brand X aspirin. If 2000 doctors were surveyed, how many used brand X?

Answer 1

For the answer to the question above,
The ratio is 2:3 

2/5 = part of doctors that do not use brand x aspirin. 
3/5 = part of doctors that use brand x aspirin. 
2000 = total number of doctors surveyed. 

so.. 

Number of doctors that use brand x aspirin: 
3/5 * 2000 
= 1200 doctors 

Number of doctors that do not use brand x aspirin: 
2/5 * 2000 
= 800 doctors 

So the answer is 1200 doctors.