The Sum Of Two Numbers Is 78 And Their Difference Is 13
The problem given says that 2 unknown numbers are given, whose sum is equal to 78 and the difference is 13. Let's find the two numbers :When we add the two numbers :
X + Y = 78
The difference of two numbers :
X - Y = 13
Solution :
If we add the two equations eachother , then we can find the first number.
X + Y = 78 X - Y = 13 2X = 91 |
Let's divide 91 to 2 for the first number "X" .
X/2 = 45.5
First number is 45.5
X + Y = 78
So ;
45.5 + Y = 78
Y = 78 - 45.5
Y = 32.5
Second number is 32.5
Question & Answer
The Sum Of Two Numbers Is 78 And Their Difference Is 13 : 45.5 And 32.5