The Sum Of Two Numbers Is 78 And Their Difference Is 18
The problem given says that 2 unknown numbers are given, whose sum is equal to 78 and the difference is 18. Let's find the two numbers :When we add the two numbers :
X + Y = 78
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 = 78 X - Y = 18 2X = 96 |
Let's divide 96 to 2 for the first number "X" .
X/2 = 48
First number is 48
X + Y = 78
So ;
48 + Y = 78
Y = 78 - 48
Y = 30
Second number is 30
Question & Answer
The Sum Of Two Numbers Is 78 And Their Difference Is 18 : 48 And 30