The Sum Of Two Numbers Is 21 And Their Difference Is 3
The problem given says that 2 unknown numbers are given, whose sum is equal to 21 and the difference is 3. Let's find the two numbers :When we add the two numbers :
X + Y = 21
The difference of two numbers :
X - Y = 3
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 21 X - Y = 3 2X = 24 |
Let's divide 24 to 2 for the first number "X" .
X/2 = 12
First number is 12
X + Y = 21
So ;
12 + Y = 21
Y = 21 - 12
Y = 9
Second number is 9
Question & Answer
The Sum Of Two Numbers Is 21 And Their Difference Is 3 : 12 And 9