There are 280 doctors and nurses at a hospital. If the ratio of doctors to nurses is 5 to 9, how many nurses are at the hospital?  Choose the correct choice from the following answers:
A) 165 B) 170 C) 175 D) 180 E) 185
The number of nurses at the hospital is (9/14)*280= 
<gadget id="calculator">(9/14)*280</gadget>
<output>180</output>
180.   The answer is 180.
<result>D</result>
There are 280 doctors and nurses at a hospital. If the ratio of doctors to nurses is 5 to 9, how many nurses are at the hospital?