Your piggy bank has 25 coins in it; some are quarters and some are nickels. You have $3.45. How many nickels do you have? (I know you can figure this out by trial and error, but you must write the equations and solve.)
Hint: You have two unknowns: "q" for quarters and "n" for nickels. You need two equations. Write one equation for the number of coins that you have and a second equation for the value of the coins. (An unknown number of nickels would have the value of .05n.)

Question

Your piggy bank has 25 coins in it; some are quarters and some are nickels. You have $3.45. How many nickels do you have? (I know you can figure this out by trial and error, but you must write the equations and solve.)
Hint: You have two unknowns: "q" for quarters and "n" for nickels. You need two equations. Write one equation for the number of coins that you have and a second equation for the value of the coins. (An unknown number of nickels would have the value of .05n.)