Caesars turned in his third research report his teacher said that cesar had completed 20% of his report for the school year how many research reports will he be doing during the school year

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan 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?

Can someone me and plz do the problem

Just tell me how to set up the equation.