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

[EX Q]: Problem: which number can we add to 425897 to get a number exactly divisible by 456 ?
[EX A]: 7

[EX Q]: Problem: if the sides of a triangle are 26 cm , 24 cm and 15 cm , what is its area ?
[EX A]: 180

[EX Q]: Problem: how many prime numbers are between 29 / 3 and 87 / 6 ?
[EX A]:
2