Hi VJesus12,
We're told that there are 240 doctors and nurses at a hospital and the ratio of doctors to nurses is 5 to 7. We're asked for the number of NURSES at the hospital. This question can be solved in a variety of different ways, including by TESTing THE ANSWERS.
Since the ratio of doctors to nurses is 5:7, the ratio of nurses to ALL people is 7:(5+7) = 7:12. Thus, the correct answer - when divided by 240 - will equal 7/12.
With a ratio of 5:7, MORE than half of the people are nurses, so we should start with an answer that is greater than half of 240. Let's TEST Answer D first...
Answer D: 140
IF.... there are 140 nurses, then the ratio of nurses:all = 140:240 = 140/240 = 14/24 = 7/12.
This is an exact match for what we are looking for, so this must be the answer.
Final Answer: D
GMAT assassins aren't born, they're made,
Rich
