Three cups of tapioca weigh 1 lb. How many cups are in 2 pounds?

• A. 4
• B. 5
• C. 6
• D. 7.5

Answer: (C)

Direct proportionality between cups and weight: the amount of cups scales linearly with weight when the ratio is fixed. Here, 3 cups weigh 1 lb, so there are 3 cups per 1 lb. For 2 pounds, multiply by 2: 3 × 2 = 6 cups. Any other amount would correspond to a different weight (for example, 4 cups would be 4/3 lb, 5 cups would be 5/3 lb, 7.5 cups would be 2.5 lb). So the correct amount is 6 cups.