If 6 pounds of apples cost $9, how much would 21 apples cost?

31.5 dollars
Explanation:
You can do 6+6 3 time and that equals 27 dollars, and you have one more so 9 divided by 2 is 4.5 so if you add that you get 31.5

Well if you have 20 bats you probably want 20 balls? you don’t have enough context to answer the question.