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

[EX Q]: Problem: if | x - 9 | = 3 x , then x = ?
[EX A]: - 4.

[EX Q]: Problem: a cycle is bought for rs . 900 and sold for rs . 1170 , find the gain percent ?
[EX A]: 30 %

[EX Q]: Problem: four bells commence tolling together and toll at intervals of 2 , 4 , 6 , 8 seconds respectively . in 18 minutes , how many times do they toll together ?
[EX A]:
45