The Sum Of Two Numbers Is 21 And Their Difference Is 17
The problem given says that 2 unknown numbers are given, whose sum is equal to 21 and the difference is 17. Let's find the two numbers :When we add the two numbers :
X + Y = 21
The difference of two numbers :
X - Y = 17
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 21 X - Y = 17 2X = 38 |
Let's divide 38 to 2 for the first number "X" .
X/2 = 19
First number is 19
X + Y = 21
So ;
19 + Y = 21
Y = 21 - 19
Y = 2
Second number is 2
Question & Answer
The Sum Of Two Numbers Is 21 And Their Difference Is 17 : 19 And 2