SAT Question 86636d8f: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

It's given that the customer spent $$27$ to purchase oranges at $$3$ per pound. Therefore, the number of pounds of oranges the customer purchased is $27 \left( \frac{1 \text{pound}}{\ 3} \right)$,or$9$ pounds.