The Sum Of Two Numbers Is 81 And Their Difference Is 20
The problem given says that 2 unknown numbers are given, whose sum is equal to 81 and the difference is 20. Let's find the two numbers :When we add the two numbers :
X + Y = 81
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 = 81 X - Y = 20 2X = 101 |
Let's divide 101 to 2 for the first number "X" .
X/2 = 50.5
First number is 50.5
X + Y = 81
So ;
50.5 + Y = 81
Y = 81 - 50.5
Y = 30.5
Second number is 30.5
Question & Answer
The Sum Of Two Numbers Is 81 And Their Difference Is 20 : 50.5 And 30.5