Answer:
Therefore, the host needs to order two whole pizza and order another 13/16 portion of the pizza. 
Therefore, the host must definitely order 3 pizza.
Explanation:
We know that each kid will get 3/16 of pizza. We know that have 15 kids. We calculate: 
15· 3/16 = 45/16 
We know that 46/16 is the same as 2 whole and 13/16. 
 
Therefore, the host needs to order two whole pizza and order another 13/16 portion of the pizza. 
Therefore, the host must definitely order 3 pizza.