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

Problem: find the least number must be subtracted from 105829 so that remaining no . is divisible by 21 ?
10

Problem: how many numbers between 400 and 1000 can be made with the digits 2 , 3,4 , 5,6 and 0 ?
60

Problem: by selling an article for $ 225 a person gains $ 75 . what is the gain % ?
50 %