Can you solve this without a calculator? Many people look at 10^20 /20^10 and immediately shout "0.5" or "1". But they are almost always wrong. This deceptively simple exponent problem is a classic "trap" question often found in elite entrance exams like Oxford MAT or the SAT. In this video, I’ll show you a simple algebraic trick using the Laws of Exponents that allows you to simplify this massive number in under 1 minute, entirely in your head.