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

[EX Q]: Problem: if a - b = 5 and a 2 + b 2 = 31 , find the value of ab .
[EX A]: 3

[EX Q]: Problem: the owner of a furniture shop charges his customer 10 % more than the cost price . if a customer paid rs . 8800 for a computer table , then what was the cost price of the computer table ?
[EX A]: rs . 8000

[EX Q]: Problem: in an examination , 300 students appeared . out of these students ; 29 % got first division , 54 % got second division and the remaining just passed . assuming that no student failed ; find the number of students who just passed .
[EX A]:
51