There are 3 types of meat, 6 types of vegetables, and 3 kinds of cheese. customers may choose one meat, one vegetable, and one cheese. enter values to answer the questions below.

Well, the questions aren't there, so here are the percentages:

Of the meat, %
Of the veggies, %
Of the cheese, %

If you can get  of the meats, then you can get 30% of the meat, or 8.3% out of the total, or 30% of the three things you can get.

If you can get  of the veggies, then you can get 16.6% of the veggies, or 8.3% of the total, or 30% of the three things you can get.

If you can get of the cheeses, then you can get 30% of the cheeses, or 8.3% out of the total, or 30% of the three things you can get.

Provide more info and I'll have a better answer :)