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