SOLUTION: I am thinking of two numbers. One of them is 11 more than the other and their sum is 131. Form an equation and solve it to find the other two numbers.
Let x be one of the two numbers.
Then the other is 131-x.
You know that
x = (131-x) + 11 -----> 2x = 142, x = = 71; 131-x = 131-71 = 60.
OR
x = (131-x) - 11 -----> 2x = 120, x = = 60; 131-x = 131-60 = 71.
The pair of numbers is (60, 71).