I would write a proportion, I can't use a fraction bar so they will just be on top of each other:
Blueberry Muffins 6
Apple Muffins 5
For every 6 Blueberry muffins there are 5 apple muffins (dozens)
So when he makes 16 blueberry muffins (dozens)
You write it next to the '6' because it's talking about blueberry muffin dozens.
The proportion now:
Blueberry Muffins 6 16
Apple Muffins 5 x
To find x, or the number of apple muffin dozens, you multiply 16 * 5, which is
80.
Then divide by 6.
80/6= 13.333
You can't have .333 of a dozen, so round it to 13.
***ANSWER***
He prepared 13 Apple muffin dozens.
Hope this helped <3
