In the number line, which mixed number is represented by X?

1. Determine the value of one interval on the number line

The total difference between the major tick marks is $4 - 2 = 2$.
There are 6 equal intervals between 2 and 4.
Value of one interval = $\frac{2}{6} = \frac{1}{3}$.

2. Calculate the value represented by X

X is at the 5th tick mark after 2.
Value of X = $2 + 5 \times \frac{1}{3} = 2 + \frac{5}{3} = 2 + 1\frac{2}{3} = 3\frac{2}{3}$.
Alternatively, X is 1 tick mark before 4: $4 - \frac{1}{3} = 3\frac{2}{3}$.