The task is to generate the correct answer for a given math problem.

Q: Problem: students at a school were on average 180 cm tall . the average female height was 170 cm , and the average male height was 184 cms . what was the ratio a of men to women ?

A: 5 : 2
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Q: Problem: the speed of a car is 85 km in the first hour and 45 km in the second hour . what is the average speed of the car ?

A: 65 kmph
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Q: Problem: if ( x + 3 ) ^ 2 / ( 2 x + 15 ) = 3 , then the difference between the two possible values of x is :

A:
12
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