The Sum Of Two Numbers Is 31 And Their Difference Is 7
The problem given says that 2 unknown numbers are given, whose sum is equal to 31 and the difference is 7. Let's find the two numbers :When we add the two numbers :
X + Y = 31
The difference of two numbers :
X - Y = 7
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 31 X - Y = 7 2X = 38 |
Let's divide 38 to 2 for the first number "X" .
X/2 = 19
First number is 19
X + Y = 31
So ;
19 + Y = 31
Y = 31 - 19
Y = 12
Second number is 12
Question & Answer
The Sum Of Two Numbers Is 31 And Their Difference Is 7 : 19 And 12