Can you guide me through solving this problem: Tim enters a competition and has to try and guess the number of red jelly beans in a jar.  The jar has a square base and is 6 inches by 6 inches and 15 inches tall.  He knows that a jelly bean is .15 cubic inches.  He also knows that they get about 80% efficiency in packing.  He estimates 30% of the jelly beans are red.  The true number of red jelly beans in the container is 900.  How far off was his guess?