In a meeting, when the spreadsheet gets glitchy, the tetchy boss throws an issue to all or any . "Our profit might be 26% of 3400000. what proportion is it? Rax?" Rax cannot call the manager at this point , because she is that the manager. And, she left her phone on the desk. She doesn't have access to a calculator. While she blankly stares into her impending future, Chandler intervenes to save lots of the sport . "It's 884000, Monika. Could I BE any longer correct?" Monika, boss lady, didn't look impressed. Not because Chandler was wrong - he was right and oh so quick! - but because she got irritated together with his cocky attitude. The question here is, how could he find the solution so quickly? Algebra was his saviour: (x+a)(x-a) = x²-a². Observe, that x is that the average of (x+a) and (x-a). This method works smoothly for numbers with even differences. The average of 26 and 34 is 30. So, 26×...