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

[EX Q]: Problem: the average ( arithmetic mean ) of 8 numbers is 43.1 . if the sum of half of these numbers is 158.4 , what is the average of the other half ?
[EX A]: 46.6

[EX Q]: Problem: the length of a rectangle is increased by 15 % and its breadth is decreased by 20 % . what is the effect on its area ?
[EX A]: 920

[EX Q]: Problem: a and b go around a circular track of length 200 m on a cycle at speeds of 36 kmph and 72 kmph . after how much time will they meet for the first time at the starting point ?
[EX A]:
20 sec