Answer:
✨19 Milkshakes✨
19
Explanation:
Given that for every 4 milkshakes sold we get $15.
⇒ 1 milkshake cost = 15 ÷ 4 = $3.75
So, if they made $71.25 in one hour then the number of milkshakes sold
= 71.25 ÷ 3.75
= 19
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