The Sum Of Two Numbers Is 27 And Their Difference Is 15

The problem given says that 2 unknown numbers are given, whose sum is equal to 27 and the difference is 15. Let's find the two numbers :

When we add the two numbers :
X + Y = 27

The difference of two numbers :
X - Y = 15

Solution :

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

X + Y = 27
X - Y = 15

2X = 42

Let's divide 42 to 2 for the first number "X" .

X/2 = 21

First number is 21

X + Y = 27
So ;
21 + Y = 27
Y = 27 - 21
Y = 6

Second number is 6

Question & Answer
The Sum Of Two Numbers Is 27 And Their Difference Is 15 : 21 And 6