Lizzy: Liezl prepared four sets of 2-dozen paper cups for her daughter's birthday party. If 5 cups were damaged and 30 were not used, how many paper cups were used?.
Me: Hmmm, let me think. I think this is the detailed solution:
Since 1 dozen is equal to 12 then 2 dozens of cups is equal to 2 x 12 = 24 cups. So, Liezl prepared a total of 24 cups x 4 sets = 96 paper cups. A total of 5 + 30 = 35 paper cups were not used. Hence, 96 - 35 = 61 paper cups were used. Final answer: 61.