Muffin Sales Analysis

A local bakery sells three types of muffins: blueberry, chocolate, and banana. Last week, the bakery sold a total of 120 muffins. The number of blueberry muffins sold was twice the number of chocolate muffins sold, and the banana muffins sold were 20 less than the number of chocolate muffins sold.

How many blueberry muffins were sold last week?