The Sum Of Two Numbers Is 55 And Their Difference Is 15

The problem given says that 2 unknown numbers are given, whose sum is equal to 55 and the difference is 15. Let's find the two numbers :

When we add the two numbers :
X + Y = 55

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 = 55
X - Y = 15

2X = 70

Let's divide 70 to 2 for the first number "X" .

X/2 = 35

First number is 35

X + Y = 55
So ;
35 + Y = 55
Y = 55 - 35
Y = 20

Second number is 20

Question & Answer
The Sum Of Two Numbers Is 55 And Their Difference Is 15 : 35 And 20