instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: the compound interest on $ 30,000 at 7 % p . a is $ . 4347 . find out the period ( in years ) ?
answer:
2


question:
Problem: two cars start at the same time from opposite ends of a highway that is 175 miles long . one car is riding at 25 mph and the second car is riding at 45 mph . how long after they begin will they meet ?
answer:
2.5


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

10