"If the distance from the earth to the sun were only half as much as it actually is, how many days (i.e., 24-hour periods) would it take the earth to complete one orbit?"
For Advanced Puzzle Solvers (APSs), after you solve the regular puzzle: "How long would a 'day' (noon to noon) be on this 'new' earth?" (Assume that the rate of rotation for the "new" earth is the same as for the "current" earth.)