Sigh. It's not like the battery count is even remotely approaching calculus or statistics or anything. It's remedial maths! Number of batteries per unit X Number of units X Number of performances = BATTERY COUNT!!!!
It's not the math that they have problems with. It's the notion of when to do it.
If this is the same set of grad students over and over, I suggest being an asshole.If it was just to spite them, I'd not think twice. But, it being the undergrad musical, and the leads usually get the small pack (which would use the AAA batteries), it would be hurting the entire production. Some performers wouldn't have a working microphone. So, not quite as easy as just being as ass to the grad students.
Follow up. I told him I needed a hard count of what was on hand, and what is needed, and when they would need them by. If there was enough to get through today, then it would be coming down early tomorrow to pass off more batteries, thus allowing me a day off. He texted 30 min later. "OK we are good. the[crew] put the other batteries in a different place & forgot they were there". Thus proving this grad student is NOT a leader. He is confronted with an issue, and instead of thinking it through, he reacts with out thinking. In this instance, the thought was "need more batteries" rather than, "how many do we have, and how many do we need".
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