The difference between the reciprocal of two natural numbers is 1 in 12. What is the solution to the problem of how many of these two numbers are

The difference between the reciprocal of two natural numbers is 1 in 12. What is the solution to the problem of how many of these two numbers are

1 / X-1 / y = 1 / 12 (Y-X) / xy = 1 / 12, xy = 12 and X, y are natural numbers, so they are 1,12 or 2,6 or 3,4, and Y is 4 and X is 3 because Y-X = 1