The Sum Of Two Numbers Is 69 And Their Difference Is 21

The problem given says that 2 unknown numbers are given, whose sum is equal to 69 and the difference is 21. Let's find the two numbers :

When we add the two numbers :
X + Y = 69

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 = 69
X - Y = 21

2X = 90

Let's divide 90 to 2 for the first number "X" .

X/2 = 45

First number is 45

X + Y = 69
So ;
45 + Y = 69
Y = 69 - 45
Y = 24

Second number is 24

Question & Answer
The Sum Of Two Numbers Is 69 And Their Difference Is 21 : 45 And 24