The Sum Of Two Numbers Is 90 And Their Difference Is 12
The problem given says that 2 unknown numbers are given, whose sum is equal to 90 and the difference is 12. Let's find the two numbers :When we add the two numbers :
X + Y = 90
The difference of two numbers :
X - Y = 12
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 90 X - Y = 12 2X = 102 |
Let's divide 102 to 2 for the first number "X" .
X/2 = 51
First number is 51
X + Y = 90
So ;
51 + Y = 90
Y = 90 - 51
Y = 39
Second number is 39
Question & Answer
The Sum Of Two Numbers Is 90 And Their Difference Is 12 : 51 And 39