Hi there!
Let’s take a look at the question.
One can of paint contains 2 2/5. We can make it easier by transforming the fraction (2 2/5) to a decimal (2.4). Now you have 2.4. Next, it says “one dozen”. One dozen refers to 12 cans. You’ll want to multiply 2.4 with 12.
Your answer is 28.8, or 28 4/5.
Hope this helps!