The Sum Of Two Numbers Is 90 And Their Difference Is 7
The problem given says that 2 unknown numbers are given, whose sum is equal to 90 and the difference is 7. Let's find the two numbers :When we add the two numbers :
X + Y = 90
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 = 90 X - Y = 7 2X = 97 |
Let's divide 97 to 2 for the first number "X" .
X/2 = 48.5
First number is 48.5
X + Y = 90
So ;
48.5 + Y = 90
Y = 90 - 48.5
Y = 41.5
Second number is 41.5
Question & Answer
The Sum Of Two Numbers Is 90 And Their Difference Is 7 : 48.5 And 41.5