The Sum Of Two Numbers Is 65 And Their Difference Is 21

The problem given says that 2 unknown numbers are given, whose sum is equal to 65 and the difference is 21. Let's find the two numbers :

When we add the two numbers :
X + Y = 65

The difference of two numbers :
X - Y = 21

Solution :

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

X + Y = 65
X - Y = 21

2X = 86

Let's divide 86 to 2 for the first number "X" .

X/2 = 43

First number is 43

X + Y = 65
So ;
43 + Y = 65
Y = 65 - 43
Y = 22

Second number is 22

Question & Answer
The Sum Of Two Numbers Is 65 And Their Difference Is 21 : 43 And 22