Answer:
Ana used 13 plates
Explanation:
Total muffins baked=82
She placed 4 aside for her friends and sell the remaining
Total sellable muffins = 82-4
=78 muffins
Ana placed 6 muffins on each plate
How much plate does she needs?
=Total sellable muffins/ no. per plate
= 78/6
= 13 plates
Ana used 13 plates