Here is a new Challenge Problem! If you want to win prizes, try entering our Challenge Problem Showdown . The more people that enter our challenge, the better the prizes! [...]

Recently, we talked about quant problems where it seems that the GMAT test writers are more interested in our ability to set up the problem than in our ability to [...]

There's only one way to get a Knewton t-shirt free today. And that is to answer this question correctly and show your work. In the below diagram, points A and [...]

Math is back; the shirt is forever. Work is to be shown. A certain floor of an office building has 1,200 square feet of floor area allocated to 2 equally [...]

Welcome back to this week's Challenge Problem! As always, the problem and solution below were written by one of our fantastic instructors . Each challenge problem represents a 700+ level [...]

What size shirt do you wear? Actually, we don't care unless you win. First person who answers correctly with shown work wins. In the figure below, rectangles CABD and PMNQ are [...]