125 centimeters to 87.5 cenitimeters

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?

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion

Pls the last one and it has to be like number 6