The Sum Of Two Numbers Is 21 And Their Difference Is 4
The problem given says that 2 unknown numbers are given, whose sum is equal to 21 and the difference is 4. Let's find the two numbers :When we add the two numbers :
X + Y = 21
The difference of two numbers :
X - Y = 4
Solution :
If we add the two equations eachother , then we can find the first number.
X + Y = 21 X - Y = 4 2X = 25 |
Let's divide 25 to 2 for the first number "X" .
X/2 = 12.5
First number is 12.5
X + Y = 21
So ;
12.5 + Y = 21
Y = 21 - 12.5
Y = 8.5
Second number is 8.5
Question & Answer
The Sum Of Two Numbers Is 21 And Their Difference Is 4 : 12.5 And 8.5