How many bags of chips should I get for about 30 teens? And 2 liters of soda?

I'm having a Halloween party next month, and my mom needs me to come up with some kind of budget for the food. The party is going to have 30 teens max, and my dad is catering the pizza and we'll have plenty of candy out, too. Knowing that there's going to be that food already, how many bags of chips... show more I'm having a Halloween party next month, and my mom needs me to come up with some kind of budget for the food. The party is going to have 30 teens max, and my dad is catering the pizza and we'll have plenty of candy out, too. Knowing that there's going to be that food already, how many bags of chips should I get, and what kinds? And how about 2 liters of soda? Thanks!!
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