The Sum of Two Numbers is 76 and Their Difference is 7

The sum of two numbers is 76 and their difference is 7. 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 76. In other words, x plus y equals 76 and can be written as equation A:

x + y = 76

The difference between x and y is 7. In other words, x minus y equals 7 and can be written as equation B:

x - y = 7

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

x - y = 7
x = 7 + y

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

x + y = 76
7 + y + y = 76
7 + 2y = 76
2y = 69
y = 34.5

Now we know y is 34.5. Which means that we can substitute y for 34.5 in equation A and solve for x:

x + y = 76
x + 34.5 = 76
X = 41.5

Summary: The sum of two numbers is 76 and their difference is 7. What are the two numbers? Answer: 41.5 and 34.5 as proven here:

Sum: 41.5 + 34.5 = 76
Difference: 41.5 - 34.5 = 7

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