Which of the following is NOT one of the three quantities in a typical world problem?

• A. Start quantity
• B. Change quantity
• C. Result quantity
• D. Average quantity

Answer: (D)

In a typical world problem, you track how a quantity changes by identifying the starting amount, how much it changes, and the resulting amount after the change. Those three pieces are start quantity, change quantity, and result quantity. The average quantity isn’t part of this standard structure because averaging would only come into play if you were asked to find the mean of values, not to describe a single change. For example, starting with 10 and increasing by 4 gives a start quantity of 10, a change quantity of 4, and a result quantity of 14. The notion of an average quantity isn’t needed to describe that change, so it’s the option that doesn’t fit.