The Sum of Two Numbers is 70 and Their Difference is 5

The sum of two numbers is 70 and their difference is 5. What are the two numbers? Let's start by calling the two numbers we are looking for x and y.

The sum of x and y is 70. In other words, x plus y equals 70 and can be written as equation A:

x + y = 70

The difference between x and y is 5. In other words, x minus y equals 5 and can be written as equation B:

x - y = 5

Now solve equation B for x to get the revised equation B:

x - y = 5
x = 5 + y

Then substitute x in equation A from the revised equation B and then solve for y:

x + y = 70
5 + y + y = 70
5 + 2y = 70
2y = 65
y = 32.5

Now we know y is 32.5. Which means that we can substitute y for 32.5 in equation A and solve for x:

x + y = 70
x + 32.5 = 70
X = 37.5

Summary: The sum of two numbers is 70 and their difference is 5. What are the two numbers? Answer: 37.5 and 32.5 as proven here:

Sum: 37.5 + 32.5 = 70
Difference: 37.5 - 32.5 = 5

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