The answer to that question is the volume of the building minus some factor (let's say 40%) for other stuff like walls and floors, etc. times the number of tenn

The answer to that question is the volume of the building minus some factor (let's say 40%) for other stuff like walls and floors, etc. times the number of tennis balls you can fit in a given space, like a cubic meter. Basically... x * y * z * 0.6 * n If you could quickly express it like that, despite not actually coming up with a number, you would probably pass. To me, being able to estimate the scope of things before launching into writing code is a valuable skill, but there's something about the quirkiness(?) of how the question is presented that's off-putting to some people. But on the other hand, maybe that's by design, and those people are the ones being selected out?