# Topic 3: Fractions

Try the problem below. After you try the problem, you can watch a video to see a correct solution.
Xu Li and Elsa received a box of chocolates as a gift. Xu Li ate $$\frac{2}{7}$$ of the box of chocolates and Elsa ate $$\frac{3}{5}$$ of the same box of chocolates. What fraction of the box of chocolates is left to serve to guests?
 A $$\displaystyle{\frac{31}{35}}$$ B $$\displaystyle{\frac{5}{12}}$$ C $$\displaystyle{\frac{4}{35}}$$ D $$\displaystyle{\frac{5}{35}}$$ E $$\displaystyle{\frac{29}{35}}$$

After watching the video, try this problem to practice more.

James and Gary bought a pizza pie for dinner. James ate $$\frac{1}{6}$$ of the pie and Gary ate $$\frac{2}{9}$$ of the same pizza pie. How much of the pizza pie is left for the rest of the family?
 A $$\displaystyle{\frac{11}{18}}$$ B $$\displaystyle{\frac{4}{5}}$$ C $$\displaystyle{\frac{1}{5}}$$ D $$\displaystyle{\frac{7}{18}}$$ E $$\displaystyle{\frac{1}{27}}$$