Question 133436
The sum of two numbers is 50. The difference of the same two numbers is 4. Find the two numbers.

Let x = the first number.

Let (50 - x) = the second number.

This is like saying if I have 50 cents and gave you 20 cents, 
then I have (50 - 20) cents left in my pockets.

Back to your question.  

The difference of the first number and the second number = 4.

x -(50 - x) = 4

We now solve for x.

x - 50 + x = 4

2x = 50 + 4

2x = 54

x = 54/2

x = 27

The two numbers are 27 and 50 - 27 or 23.

Did you follow?