Mrs. Smith runs a dessert parlor. Her top-selling items are mixed berry smoothies and milkshakes. She sells mixed berry smoothies for $5 each and milksh
for $3 each. Mrs. Smith wants to sell at least 60 mixed berry smoothies and milkshakes in all and wants to earn at least $210. Each mixed berry smoothie ta
7 minutes to make, and each milkshake takes 3 minutes to make.
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How many mixed berry smoothies and milkshakes should Mrs. Smith make to minimize the time she spends making the desserts, also selling at least the
minimum total number and earning at least the minimum amount of money?