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If you have forgot, tell them about when you learned it and what book you would examine to find the answer. Then try to derive the answer from basic principles.
The question I had in mind is a type which has many answeres which are different tradeoffs. One example would be what wire size to use. You would then have to discuss voltge drop, cost, physical limits of the routing area, flicker of lights on the same circuit, and legal requirements.
Another example would be what transmitter power, antenna gain, antenna tower height, and line attenuation should be used in a given situation.
Another example would be a circuit that cannot be seen inside a container with two external terminals. Certain measurements show certain results. What is the circuit part values and wiring?