Given that 10 is the arithmetic mean of the set $\{6, 13, 18, 4, x\}$, what is the value of $x$?
I need to find the value of $x$ that makes the arithmetic mean of the set equal to 10. The arithmetic mean of a set of numbers is the sum of the numbers divided by the number of numbers. In this case, the arithmetic mean is $\frac{6 + 13 + 18 + 4 + x}{5}$. I want this to be equal to 10, so I can set up an equation: $\frac{6 + 13 + 18 + 4 + x}{5} = 10$. To solve for $x$, I can multiply both sides by 5 to get rid of the fraction: $6 + 13 + 18 + 4 + x = 50$. Then I can subtract 6, 13, 18, and 4 from both sides to isolate $x$: $x = 50 - 6 - 13 - 18 - 4$. Simplifying the right side, I get: $x = 9$. This is the value of $x$ that makes the arithmetic mean of the set 10. 