The Sum Of Two Numbers Is 20 And Their Difference Is 7
The problem given says that 2 unknown numbers are given, whose sum is equal to 20 and the difference is 7. Let's find the two numbers :When we add the two numbers :
X + Y = 20
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 = 20 X - Y = 7 2X = 27 |
Let's divide 27 to 2 for the first number "X" .
X/2 = 13.5
First number is 13.5
X + Y = 20
So ;
13.5 + Y = 20
Y = 20 - 13.5
Y = 6.5
Second number is 6.5
Question & Answer
The Sum Of Two Numbers Is 20 And Their Difference Is 7 : 13.5 And 6.5