From the diagram, determine the volume of the following: 24 mL and 75 mL, 25 mL and 75 mL, 24 mL and 74 mL, or 25 mL and 73 mL.

• A. 24 mL and 75 mL
• B. 25 mL and 75 mL
• C. 24 mL and 74 mL
• D. 25 mL and 73 mL

Answer: (A)

Reading a graduated instrument comes down to noting the two levels shown by the liquid: the start and the finish. The diagram places the initial liquid level at 24 mL and the final level at 75 mL, so those two readings are the volumes represented. The other options don’t align with where the meniscus sits on the scale in the diagram, so they don’t reflect the shown levels. If you needed the amount delivered, you’d subtract to get 75 mL − 24 mL = 51 mL.