Alan knows that Carter has a bunch of nickels and dimes in her pocket and that the total amount is $1.25. Write an equation that describes the relationship between the number of dimes and the number of nickels in Carter's pocket.

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?