The Sum Of Two Numbers Is 90 And Their Difference Is 20
The problem given says that 2 unknown numbers are given, whose sum is equal to 90 and the difference is 20. Let's find the two numbers :When we add the two numbers :
X + Y = 90
The difference of two numbers :
X - Y = 20
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 90 X - Y = 20 2X = 110 |
Let's divide 110 to 2 for the first number "X" .
X/2 = 55
First number is 55
X + Y = 90
So ;
55 + Y = 90
Y = 90 - 55
Y = 35
Second number is 35
Question & Answer
The Sum Of Two Numbers Is 90 And Their Difference Is 20 : 55 And 35