The Sum Of Two Numbers Is 80 And Their Difference Is 4

The problem given says that 2 unknown numbers are given, whose sum is equal to 80 and the difference is 4. Let's find the two numbers :

When we add the two numbers :
X + Y = 80

The difference of two numbers :
X - Y = 4

Solution :

If we add the two equations eachother , then we can find the first number.

X + Y = 80
X - Y = 4

2X = 84

Let's divide 84 to 2 for the first number "X" .

X/2 = 42

First number is 42

X + Y = 80
So ;
42 + Y = 80
Y = 80 - 42
Y = 38

Second number is 38

Question & Answer
The Sum Of Two Numbers Is 80 And Their Difference Is 4 : 42 And 38