Hi!
Your answer would be: 10 cups of flour.
Reason being: You have 8 cups of flour to 24 muffins, which can be shown as 8:24, or 8/24.
You need to find x cups of flour to 30 muffins, which can be shown as x:30, or x/30. You will want to cross multiply.
8 x 24 30
8 x 30 = 24 x X
240 = 24x
10 = x
Therefore, you need 10 cups of flour.
Hope this helps!
Yours truly,