Orly uses 2 cups of raisins for every 8 cups of trail mix she makes. How many cups of trail mix will she make if she uses 10 cups of raisins?

16 because if you count how many cups of raisins and count how many cups of trail mix you get 6 in between so you take the ten cups of raisins and add 6 to it so you get 16

2:8 = ?:12

2/8 = x/12

cross multiply to get

2 x

- - - = - - -

8 12

2*12=24 8*x=8x

24=8x

8x/8 = 24/8

24/8=x

x=3