Least Common Multiple (LCM) — Definition & Examples

The Expii Content Team's favorite breakfast food is two eggs on toast. At the supermarket, eggs are sold in cartons of $12$ and loaves of bread are sold in packages with $20$ slices each. Po-Shen Loh buys some unknown number of eggs and loaves of bread; after making two eggs on toast for everyone, he sees that there are no ingredients left over! What is the minimal number of bread loaves necessary for this to be possible?