Are these fractions proportional or non proportional?

3/8 , 13/40

Work please!

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?

What does x = in this equation x+3+2x=x+5

How is working backward similar to solving an equation?