The Sum Of Two Numbers Is 87 And Their Difference Is 21
The problem given says that 2 unknown numbers are given, whose sum is equal to 87 and the difference is 21. Let's find the two numbers :When we add the two numbers :
X + Y = 87
The difference of two numbers :
X - Y = 21
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 87 X - Y = 21 2X = 108 |
Let's divide 108 to 2 for the first number "X" .
X/2 = 54
First number is 54
X + Y = 87
So ;
54 + Y = 87
Y = 87 - 54
Y = 33
Second number is 33
Question & Answer
The Sum Of Two Numbers Is 87 And Their Difference Is 21 : 54 And 33