There were 100 pizzas sold at Romeo's Pizzeria on Tuesday. A large pizza costs $16 and a small pizza costs $11. If $1,550 worth of pizzas were sold in all, how many small pizzas were sold?

Step-by-step explanation:

Let number of large pizzas be l and number of small be s.

Then we have equations:

From the first equation, we get l = 100 - s and substitute in the second equation:

Number of small pizzas is 10

1/5^2 = 7.56/45