What gose into 25 and 18?

To find what goes into 25 and 18, we look for their common factors. The factors of 25 are 1, 5, and 25, while the factors of 18 are 1, 2, 3, 6, 9, and 18. The only common factor between the two numbers is 1, indicating that they are relatively prime. Therefore, the greatest common divisor (GCD) of 25 and 18 is 1.