Final answer:
The maximum working height for a ladder jack scaffold depends on various factors, such as the scaffold design, load capacity, and safety regulations.
Step-by-step explanation:
The maximum working height for the platform of a ladder jack scaffold depends on the specific scaffold design and regulations. The options provided in the question are 20 feet, 25 feet, 30 feet, and 35 feet. To determine the maximum working height, it is important to consider factors such as the type of scaffold, its load capacity, and any safety regulations that may apply.
For example, in the given reference, there is no specific mention of the maximum working height for a ladder jack scaffold. Instead, the reference provides information about the tension in cables and the mass of the equipment in a scaffold system. It is important to consult applicable safety guidelines and manufacturers' specifications to determine the maximum working height for a ladder jack scaffold.