instruction:
The task is to generate the correct answer for a given math problem.
question:
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 ?
answer:
5 : 2

question:
Problem: if a a b = 2 a - 3 b + ab , then 3 a 2 + 2 a 3 is equal to :
answer:
7

question:
Problem: working alone , printers x , y , and z can do a certain printing job , consisting of a large number of pages , in 12 , 20 , and 20 hours , respectively . what is the ratio of the time it takes printer x to do the job , working alone at its rate , to the time it takes printers y and z to do the job , working together at their individual rates ?
answer:
10 / 1