The Sum Of Two Numbers Is 67 And Their Difference Is 20

The problem given says that 2 unknown numbers are given, whose sum is equal to 67 and the difference is 20. Let's find the two numbers :

When we add the two numbers :
X + Y = 67

The difference of two numbers :
X - Y = 20

Solution :

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

X + Y = 67
X - Y = 20

2X = 87

Let's divide 87 to 2 for the first number "X" .

X/2 = 43.5

First number is 43.5

X + Y = 67
So ;
43.5 + Y = 67
Y = 67 - 43.5
Y = 23.5

Second number is 23.5

Question & Answer
The Sum Of Two Numbers Is 67 And Their Difference Is 20 : 43.5 And 23.5