The Sum Of Two Numbers Is 81 And Their Difference Is 15

The problem given says that 2 unknown numbers are given, whose sum is equal to 81 and the difference is 15. Let's find the two numbers :

When we add the two numbers :
X + Y = 81

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 = 81
X - Y = 15

2X = 96

Let's divide 96 to 2 for the first number "X" .

X/2 = 48

First number is 48

X + Y = 81
So ;
48 + Y = 81
Y = 81 - 48
Y = 33

Second number is 33

Question & Answer
The Sum Of Two Numbers Is 81 And Their Difference Is 15 : 48 And 33

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