When the integer n is divided by 18, the quotient is x and the remainder is 6, When the integer n is divided by 25, the quotient is y and the remainder is 15. Which of the following is true?
1
25y - 18x = 9
2
18x - 25y = 9
3
18x + 25y = 9
4
More than one of the above
5
None of the above