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

[Q]: Problem: the total age of a and b is 12 years more than the total age of b and c . c is how many year younger than a
[A]: 12


[Q]: Problem: sachin is older than rahul by 7 years . if the ratio of their ages is 11 : 9 , find the age of sachin
[A]: 38.5


[Q]: Problem: mark and ann together were allocated n boxes of cookies to sell for a club project . mark sold 6 boxes less than n and ann sold 2 boxes less than n . if mark and ann have each sold at least one box of cookies , but together they have sold less than n boxes , what is the value of n ?
[A]: