One night 19 percent of the female officers on a police force were on duty. If 152 police officers were on duty that night and half of these were female officers, how many female officers were on the police force?
Choices.
A) 300  B) 350  C) 400  D) 450  E) 500
Let x be the number of female police officers on the police force.   The number of female police officers on duty was 76.   0.19x = 76   x = 400   The answer is 400.
<result>C</result>
One night 19 percent of the female officers on a police force were on duty. If 152 police officers were on duty that night and half of these were female officers, how many female officers were on the police force?