"A problem which reveals the failure of Math: there are 28 seats, all side-by-side in a row, along one wall of a bus depot. How many people do they seat?
"14, if no one is a dick, because generous people only take up three seats, one for the butt, and two as a barrier on either side so no one will sit near them. More likely, 12 or 13 people fit, though more if some arrive in couples without so much entitlement about baggage. You might squeeze 18 people onto 28 seats if you have some genuine humanitarians in the depot.