Problem of the Week
Problem D
Sticker Situation

Kendi has a large collection of vinyl stickers, and each sticker has an animal on it or an emoji on it (but not both). In this collection, $300$ of the stickers have animals on them, and $1$ out of $5$ of all of the stickers have animals on them. She would like to add more stickers to her collection so that there are $3$ stickers with animals on them out of every $10$ stickers.

If she can buy the stickers in packages of $60$ stickers where $21$ are animal stickers and the remaining are emoji stickers, how many whole packages does she need to buy?