instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: if a drawing has an outer circle of diameter 30 and an inner circle of diameter 24 , then what fraction of outer circle ' s surface is not covered by the inner circle ?
answer:
9 / 25', 'e ) 2 / 3'


question:
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 .
answer:
26


question:
Problem: in 10 years , a will be twice as old as b was 10 years ago . if a is now 9 years older than b the present age of b is
answer:

39