The Sum Of Two Numbers Is 78 And Their Difference Is 30
The problem given says that 2 unknown numbers are given, whose sum is equal to 78 and the difference is 30. Let's find the two numbers :When we add the two numbers :
X + Y = 78
The difference of two numbers :
X - Y = 30
Solution :
If we add the two equations eachother , then we can find the first number.
X + Y = 78 X - Y = 30 2X = 108 |
Let's divide 108 to 2 for the first number "X" .
X/2 = 54
First number is 54
X + Y = 78
So ;
54 + Y = 78
Y = 78 - 54
Y = 24
Second number is 24
Question & Answer
The Sum Of Two Numbers Is 78 And Their Difference Is 30 : 54 And 24