Easy
A measuring cylinder contains 40 mL of water. When a stone is gently dropped into it, the water level rises to 65 mL. What is the volume of the stone?
Explanation
Explanation
Step 1: A solid that sinks pushes aside (displaces) water equal to its own volume.
Step 2: Volume of stone = final reading − initial reading = 65 − 40 = 25 mL.
Step 3: Since 1 mL = 1 cm³, the volume of the stone is 25 cm³.
Step 4: Do not add the readings (105) or use only one of them.
Answer: 25 cm³.
PRO TIP
Re-check your working by substituting the answer back into the original question.