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Let's say the price of one Combo A meal is $x. The teacher has up to $180 to spend, so the inequality would be:
Total cost of Combo A meals ≤ $180.
Since she wants to purchase the most number of Combo A meals, the total cost should be equal to $180, not more. So the inequality is:
Number of Combo A meals * Price of one Combo A meal ≤ $180.
Which can also be written as:
x * Number of Combo A meals ≤ $180.