Solving for Two Unknows

Question
You have a pile of nickels ($0.05) and dimes ($0.10). You have a total of 4 coins worth a total of $0.30. How many nickels do you have?

Question

You have a pile of nickels ($0.05) and dimes ($0.10). You have a total of 4 coins worth a total of $0.30. How many nickels do you have?

Solving for Two Unknowns