The sum of the two numbers is 138. One number is 36 more than the other.

To solve this task, you need to make an equation. Let the first number be x, then the second number is (x + 36). Knowing that the sum of these numbers is 138, we will draw up an equation.
x + x + 36 = 138;
2 * x + 36 = 138;
2 * x = 138 – 36;
2 * x = 102;
x = 102/2;
x = 51.
The first number is 51, the second number is 51 + 36 = 87.
Answer: 51; 87.