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

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
12

Problem: the total marks obtained by a student in mathematics and physics is 32 and his score in chemistry is 20 marks more than that in physics . find the average marks scored in mathamatics and chemistry together .
26

Problem: how many multiples of 4 are there between 12 and 92 , inclusive ?
21