Systems of Linear Inequalities, Word Problems - Examples

Chef Kevin needs to cook steak and lobster. It takes $10$ minutes to cook each steak and $15$ minutes to cook each lobster. There are at most $25$ lobsters left and $50$ steaks left. There are at least $15$ people left to serve. If $x=\text{steaks}$ and $y=\text{lobsters}$ and each person orders either a steak or a lobster, select all inequalities that belong in his problem's system.