The Sum Of Two Numbers Is 31 And Their Difference Is 9
The problem given says that 2 unknown numbers are given, whose sum is equal to 31 and the difference is 9. Let's find the two numbers :When we add the two numbers :
X + Y = 31
The difference of two numbers :
X - Y = 9
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 31 X - Y = 9 2X = 40 |
Let's divide 40 to 2 for the first number "X" .
X/2 = 20
First number is 20
X + Y = 31
So ;
20 + Y = 31
Y = 31 - 20
Y = 11
Second number is 11
Question & Answer
The Sum Of Two Numbers Is 31 And Their Difference Is 9 : 20 And 11