The Sum Of Two Numbers Is 90 And Their Difference Is 18
The problem given says that 2 unknown numbers are given, whose sum is equal to 90 and the difference is 18. Let's find the two numbers :When we add the two numbers :
X + Y = 90
The difference of two numbers :
X - Y = 18
Solution :
If we add the two equations eachother , then we can find the first number.
X + Y = 90 X - Y = 18 2X = 108 |
Let's divide 108 to 2 for the first number "X" .
X/2 = 54
First number is 54
X + Y = 90
So ;
54 + Y = 90
Y = 90 - 54
Y = 36
Second number is 36
Question & Answer
The Sum Of Two Numbers Is 90 And Their Difference Is 18 : 54 And 36