The Sum Of Two Numbers Is 78 And Their Difference Is 20
The problem given says that 2 unknown numbers are given, whose sum is equal to 78 and the difference is 20. Let's find the two numbers :When we add the two numbers :
X + Y = 78
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 = 78 X - Y = 20 2X = 98 |
Let's divide 98 to 2 for the first number "X" .
X/2 = 49
First number is 49
X + Y = 78
So ;
49 + Y = 78
Y = 78 - 49
Y = 29
Second number is 29
Question & Answer
The Sum Of Two Numbers Is 78 And Their Difference Is 20 : 49 And 29