The Sum Of Two Numbers Is 21 And Their Difference Is 8
The problem given says that 2 unknown numbers are given, whose sum is equal to 21 and the difference is 8. Let's find the two numbers :When we add the two numbers :
X + Y = 21
The difference of two numbers :
X - Y = 8
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 21 X - Y = 8 2X = 29 |
Let's divide 29 to 2 for the first number "X" .
X/2 = 14.5
First number is 14.5
X + Y = 21
So ;
14.5 + Y = 21
Y = 21 - 14.5
Y = 6.5
Second number is 6.5
Question & Answer
The Sum Of Two Numbers Is 21 And Their Difference Is 8 : 14.5 And 6.5