The Sum Of Two Numbers Is 21 And Their Difference Is 12
The problem given says that 2 unknown numbers are given, whose sum is equal to 21 and the difference is 12. Let's find the two numbers :When we add the two numbers :
X + Y = 21
The difference of two numbers :
X - Y = 12
Solution :
If we add the two equations eachother , then we can find the first number.
X + Y = 21 X - Y = 12 2X = 33 |
Let's divide 33 to 2 for the first number "X" .
X/2 = 16.5
First number is 16.5
X + Y = 21
So ;
16.5 + Y = 21
Y = 21 - 16.5
Y = 4.5
Second number is 4.5
Question & Answer
The Sum Of Two Numbers Is 21 And Their Difference Is 12 : 16.5 And 4.5