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

Problem: if mn = 0 and 25 percent of n equals 37 1 / 2 percent of m , what is the value of 12 n / m ?
18

Problem: if a a b = 2 a - 3 b + ab , then 3 a 2 + 2 a 3 is equal to :
7

Problem: in a certain game , a large bag is filled with blue , green , purple and red chips worth 1 , 5 , x and 11 points each , respectively . the purple chips are worth more than the green chips , but less than the red chips . a certain number of chips are then selected from the bag . if the product of the point values of the selected chips is 88,000 , how many purple chips were selected ?
2