PUZZLE: Can You Do Math w/ Shapes?

[Ryan Goble]

Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. There are two types: Riddler Express for those of you who want something bite-size and Riddler Classic for those of you in the slow-puzzle movement. Submit a correct answer for either,¹ and you may get a shoutout in next week’s column. If you need a hint or have a favorite puzzle collecting dust in your attic, find me on Twitter.

Riddler Express

From Derik Moore, some shapely arithmetic:

Submit your answer

From https://fivethirtyeight.com/features/can-you-do-math-with-shapes/