On this line, we're covering all the ground between 2 and 42, or a distance of 40. How many parts are we dividing 40 into? I'll use red numbers to count:

So if a distance of 40 is divided evenly 5 times, then each tick mark must be 8, right?

**So**Let's fill in all the ticks (in green numbers) just to make sure our pattern fits:

*x*has to be 18.Yup, looks good!

**Answer (D).**

Note: Technically you could backsolve here, too. Start by trying (C), which says

*x*is 16. If that's true, then the tick mark before it has to be 9 (halfway between 2 and 16). Then you fill in all the ticks to make sure your patten fits, but it doesn't. You get 2, 9, 16, 23, 30, and a 37 where the 42 should be. You're short by a few by the time you get to 42, so you need to try a bigger number to start with. (D) of course still works.

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