Final answer:
The pizza costs $7.74.
Step-by-step explanation:
To find the cost of the pizza, we need to divide the total amount paid by Allie and Evelyn by 2. Since they each paid $7.74, the total amount paid is $7.74 + $7.74 = $15.48. Dividing this by 2, we find that the pizza costs $15.48 ÷ 2 = $7.74.