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

[Q]: Problem: how many zeroes are there at the end of the number n , if n = 70 ! + 140 ! ?
[A]: 16


[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


[Q]: Problem: if the cost price of 50 articles is equal to the selling price of 45 articles , then the gain or loss percent is ?
[A]:
11.11