Moderate# Minimum Number of Pizzas

ACTMAT-V4C9JT

The entire 21-person boys swim team is going out for pizza to celebrate winning the league title. Each swimmer can eat $ 1\frac { 1 }{ 4 } $ pizzas by himself.

What is the least number of pizzas that need to be ordered to feed the boys, if each swimmer indeed eats $ 1\frac { 1 }{ 4 } $ pizzas by himself?