There are 32 children in my class. Fun size treats come in bags of 20. What is the smallest number of bags I must buy so that each child has the same number of treats.

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done