Final answer:
A graduated cylinder is the lab equipment that is commonly used to measure liquid solutions.
Step-by-step explanation:
The lab equipment that would most likely be used to measure a liquid solution is a graduated cylinder.
A graduated cylinder is a tall, cylindrical container with markings on the side that indicate volume. It is designed to accurately measure the volume of liquids, including liquid solutions.
Other options listed, such as a flask, triple beam balance, and test tube, are not typically used for measuring volume but serve different purposes in the laboratory.