# Glow In The Dark Algebra

Not all GMAT problems have to be boring. In a word problem, they can introduce sports, fast cars, celebrities, rock and roll, or even radioactive materials. Enjoy the diversion, but put it aside to focus on the numbers you’ve been given.

## Question of the Day

The weight of a radioactive metal reduces by half every 1 second. If an experiment starts with $x$grams of the radioactive metal, which of the following expressions gives its weight in grams, after $n$ minutes?