Ellie uses 12.5 pounds of potatoes to make mashed potatoes. She uses one-tenth as many pounds of butter as potatoes. How many pounds of butter does Ellie use?
Tiffany collects perfume bottles. She has 99 bottles in her collection. Two-thirds of her perfume bottles are made of crystal. How many of the perfume bottles in Tiffany’s collection are made of crystal?
Stephen makes a blueberry pie and cuts it into 6 slices. He eats \(\frac{1}{3}\) of the pie over the weekend. How many slices of pie does Stephen eat over the weekend?