Rose bought some candy. It tasted just like black cow root beer floats! She had 45 pieces of candy she gave 5 pieces of candy to each of 3 friends. She gave 2/5 of the rest of the candy to her sister. How many pieces of candy did she have left?
45 - 3*5 = 30
2/5 * 30 = 12
30-12 = ___