Ke$ha has 45 coins in her piggy bank. She has one fewer nickel than she has dimes, and one fewer quarter than three times the number of nickels. If Ke$ha has only nickels, dimes, and quarters, how many nickels does she have?
d = n+1
q= 3n-1 summed = 45 coins
n + n+1 + 3n-1 = 45 solve for 'n' the number of nickles