Hello:

I am baking 2 cakes for my class tomorrow. I wanted to use betty crocker cake mix, one is 10x3 vanilla and the other 6x3 chocolate.

I wanted to know how many boxes do I use for the 10x3 vanilla, since I don't want to have any leftover cake mix.

Any suggestions will be appreciated.

thank you:

I use 5 cups for a 10x2 and 2 cups for a 6x2, so increasing to 6 and 3 respectively should be fine, which is one cup short of 2 full boxes (5 cups to a box of mix)

One cake mix is perfect for a 10x2 round; for a 3" deep pan I'd increase it by another 1/2 mix. I'd probably use the other 1/2 mix for the choco cake.....just add some cocoa powder (about 1/2 cup for a light choco) to the dry mix plus a pinch of baking soda for a choco cake.
If you want to keep things easy make up 2 vanilla cake mixes as usual; pour most of it into the 10" pan then add 1/2 cup cocoa powder or melted choco into the remaining batter for the choco cake.

Each pan should be filled 2/3rds full - measured w/a ruler 1 1/2"-2" deep.
That way you won't have to measure the batter by cups.....oh such a messy job!