What is the sum of the series $1 + \frac{1}{2} + \frac{1}{4} + \frac{1}{8} + \ldots$?
If $\log_2 (x) + \log_4 (x) = 5$, what is $x$?
What is the value of $\sqrt{50 + \sqrt{50 + \sqrt{50 + \ldots}}}$?
A number when divided by 7 leaves a remainder of 4. What is the remainder when its square is divided by 7?
In how many ways can 6 people be seated around a circular table?
A car travels at 60 km/h for half the distance and 80 km/h for the other half. What is the average speed for the entire journey?