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

Problem: if 5 a = 3125 , then the value of 5 ( a - 3 ) is :
25

Problem: in a circuit board factory , all circuit boards that pass a verification process are certified . every board that fails the verification process is indeed faulty , but 1 / 8 of those that pass are also faulty . approximately how many faulty circuit boards exist in a group of 3,200 circuit boards where 64 fail inspection ?
456

Problem: a number x is 12 times another number y . the percentage that y is less than x is

91.6 %