The Sum Of Two Numbers Is 15 And Their Difference Is 7
The problem given says that 2 unknown numbers are given, whose sum is equal to 15 and the difference is 7. Let's find the two numbers :When we add the two numbers :
X + Y = 15
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 = 15 X - Y = 7 2X = 22 |
Let's divide 22 to 2 for the first number "X" .
X/2 = 11
First number is 11
X + Y = 15
So ;
11 + Y = 15
Y = 15 - 11
Y = 4
Second number is 4
Question & Answer
The Sum Of Two Numbers Is 15 And Their Difference Is 7 : 11 And 4