# A box contains 5 red, 2 white, & 3 blue marbles. If a marble is selected at random, what is the probability that it is blue?

$\frac{3}{10}$ or 30%
There are $3$ blue marbles and $5 + 2 + 3 = 10$ marbles altogether.
Therefore a $\frac{3}{10}$ chance to get a blue marble.