Christine baked a pumpkin pie. She ate \(\cfrac{1}{6}\) of the pie. Her brother ate \(\cfrac{1}{3}\) of it and gave the leftovers to his friends. What fraction of the pie did he give to his friends?
Liang went to the bookstore. He spent \(\cfrac{1}{3}\) of his money on a pen and \(\cfrac{4}{7}\) of it on books. What fraction of his money did he have left?