The Sum Of Two Numbers Is 70 And Their Difference Is 15
The problem given says that 2 unknown numbers are given, whose sum is equal to 70 and the difference is 15. Let's find the two numbers :When we add the two numbers :
X + Y = 70
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 = 70 X - Y = 15 2X = 85 |
Let's divide 85 to 2 for the first number "X" .
X/2 = 42.5
First number is 42.5
X + Y = 70
So ;
42.5 + Y = 70
Y = 70 - 42.5
Y = 27.5
Second number is 27.5
Question & Answer
The Sum Of Two Numbers Is 70 And Their Difference Is 15 : 42.5 And 27.5