CPM Homework Help : MC2 Problem 10-22

There are $18$ chocolate chip cookies, $12$ oatmeal cookies, and $10$ raisin cookies in a cookie jar. If Miguel takes a cookie from the jar without looking, what is the probability that he does not get a chocolate chip cookie? Show your work to support your answer.

Help:

Take the number of cookies that are not chocolate chip out of the total number of cookies in the jar.

Hint:

Cookies that are not chocolate chips are the oatmeal and raisin cookies in this case.

Answer:

$\frac{22}{40} = \frac{11}{20}$
or $55\%$