Bakery Pastry Sales Problem

A local bakery sells three types of pastries: muffins, cookies, and brownies. Last week, the bakery sold a total of 300 pastries. The number of muffins sold was twice the number of cookies sold, and the number of brownies sold was 50 less than the number of cookies sold.

Let the number of cookies sold be represented by $c$. Then, the number of muffins sold is $2c$, and the number of brownies sold is $c - 50$.

Using this information, determine how many cookies were sold, rounding your answer to the nearest whole number if necessary. Enter your answer in the grid below.