The Sum Of Two Numbers Is 40 And Their Difference Is 20
The problem given says that 2 unknown numbers are given, whose sum is equal to 40 and the difference is 20. Let's find the two numbers :When we add the two numbers :
X + Y = 40
The difference of two numbers :
X - Y = 20
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 40 X - Y = 20 2X = 60 |
Let's divide 60 to 2 for the first number "X" .
X/2 = 30
First number is 30
X + Y = 40
So ;
30 + Y = 40
Y = 40 - 30
Y = 10
Second number is 10
Question & Answer
The Sum Of Two Numbers Is 40 And Their Difference Is 20 : 30 And 10