So we would start by setting up an equation like x + x = 57 only we know that the larger number is 15 more than the smaller number so we would change it to x + x+15 = 57 so 2x + 15 = 57. Now simply solve and 2x = 42. Divide and x is equal to 21 so the smaller number is 21. The larger number is 15 more than the small so 15 + 21 is equal to 36. The two numbers would be 21 and 36.
