The Sum Of Two Numbers Is 70 And Their Difference Is 30
The problem given says that 2 unknown numbers are given, whose sum is equal to 70 and the difference is 30. Let's find the two numbers :When we add the two numbers :
X + Y = 70
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 = 70 X - Y = 30 2X = 100 |
Let's divide 100 to 2 for the first number "X" .
X/2 = 50
First number is 50
X + Y = 70
So ;
50 + Y = 70
Y = 70 - 50
Y = 20
Second number is 20
Question & Answer
The Sum Of Two Numbers Is 70 And Their Difference Is 30 : 50 And 20