The Sum Of Two Numbers Is 90 And Their Difference Is 39
The problem given says that 2 unknown numbers are given, whose sum is equal to 90 and the difference is 39. Let's find the two numbers :When we add the two numbers :
X + Y = 90
The difference of two numbers :
X - Y = 39
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 90 X - Y = 39 2X = 129 |
Let's divide 129 to 2 for the first number "X" .
X/2 = 64.5
First number is 64.5
X + Y = 90
So ;
64.5 + Y = 90
Y = 90 - 64.5
Y = 25.5
Second number is 25.5
Question & Answer
The Sum Of Two Numbers Is 90 And Their Difference Is 39 : 64.5 And 25.5