The Sum Of Two Numbers Is 78 And Their Difference Is 15
The problem given says that 2 unknown numbers are given, whose sum is equal to 78 and the difference is 15. Let's find the two numbers :When we add the two numbers :
X + Y = 78
The difference of two numbers :
X - Y = 15
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 78 X - Y = 15 2X = 93 |
Let's divide 93 to 2 for the first number "X" .
X/2 = 46.5
First number is 46.5
X + Y = 78
So ;
46.5 + Y = 78
Y = 78 - 46.5
Y = 31.5
Second number is 31.5
Question & Answer
The Sum Of Two Numbers Is 78 And Their Difference Is 15 : 46.5 And 31.5