First, you have to make an equation which has all of the ingredients on one side and the final product on the other side.
The equation would be: 1 tb cinnamon + 2 crusts + 10 apples = 1 pie
To make 25 apple pies you have to multiply the whole equation by 25.
25 ( 1tb cinnamon + 2 crusts + 10 apples = 1 pie)
So you end up with:
25 tbs of cinnamon + 50 crusts + 250 apples = 25 pie
In other words, to make 25 pies you will need 25 tablespoons of cinnamon, 50 pie crusts, and 250 large apples.