Leo had a $30 gift card to use at a coffee shop. He used the entire balance to buy regular-sized coffees, which cost $2, and large coffees, which cost $3. If he bought 13 coffees in total, how many large coffees did he buy?

Let l be the number of large coffees and s the number of regular coffees. Since there were 13 coffees, l + s = 13; their total cost gives 3l + 2s = 30. Subtracting twice the first equation from the cost equation gives l = 30 − 26 = 4, so Leo bought 4 large coffees, choice C.

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