The task is to generate the correct answer for a given math problem.
--------
Question: Problem: one half of a two digit number exceeds its one third by 7 . what is the sum of the digits of the number ?

Answer: e ) 1

Question: Problem: what is the diagonal of a square field whose perimeter is 64 m ?

Answer: 16 2 m

Question: Problem: if a ( a + 2 ) = 48 and b ( b + 2 ) = 48 , where a = b , then a + b =

Answer:
- 9