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?

$2 coffee x 9 = $18 
$3 coffee x 4 = $12 
= 13 $30 

So therefore he bought 4 large coffee's. 
Answer - C. 4

Here, Let, number of regular-sized coffees = x
Number of large sized coffees = y

Then, x + y = 13
& 2x + 3y = 30

Multiply first equation by 2, 
2x + 2y = 26
Now, subtract it from Equation 2, 
y = 4

In short, Your Final Answer would be 4 Large Coffee's

Hope this helps!