The Sum Of Two Numbers Is 42 And Their Difference Is 20

The problem given says that 2 unknown numbers are given, whose sum is equal to 42 and the difference is 20. Let's find the two numbers :

When we add the two numbers :
X + Y = 42

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 = 42
X - Y = 20

2X = 62

Let's divide 62 to 2 for the first number "X" .

X/2 = 31

First number is 31

X + Y = 42
So ;
31 + Y = 42
Y = 42 - 31
Y = 11

Second number is 11

Question & Answer
The Sum Of Two Numbers Is 42 And Their Difference Is 20 : 31 And 11

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