The Sum Of Two Numbers Is 59 And Their Difference Is 21

The problem given says that 2 unknown numbers are given, whose sum is equal to 59 and the difference is 21. Let's find the two numbers :

When we add the two numbers :
X + Y = 59

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 = 59
X - Y = 21

2X = 80

Let's divide 80 to 2 for the first number "X" .

X/2 = 40

First number is 40

X + Y = 59
So ;
40 + Y = 59
Y = 59 - 40
Y = 19

Second number is 19

Question & Answer
The Sum Of Two Numbers Is 59 And Their Difference Is 21 : 40 And 19