Problem of the Week

Over the past several years, Ima Saver collected nickels (5 cent coins) and dimes (10 cent coins) and put them in his pink piggy bank. Only nickels and dimes went in his bank. Finally, one day, the bank was full so Ima counted his money and discovered that he had exactly $10 in the bank. He also observed that he had 11 more nickels than dimes in his bank. How many coins were in Ima Saver's pink piggy bank?