If you are making it for the class, make it as a sheet cake and cut it into small squares to match the number of eating mathematicians. A totally cool extension is to have the students bake both recipes at the same altitude and compare the results. First, talk a bit about reading in math. Most good math students will read a story problem 3 or 4 times. Most good students do not realize they have read and reread but it is a necessary technique.
Weak students tend to read it once and then have problems understanding why they are confused.
Explain that you are providing them with a long real-life math problem. Ask them how many times they should read it. Distribute the activity sheet. I recommend that they read the whole thing twice and then read the high altitude adjustments one more time and then check their reading as they do the problem. The high altitude adjustments are approximate and designed for Earth altitudes.