Area Mazes featured in FiveThirtyEight's "The Riddler"

The Original Area Mazes by Japanese puzzle master Naoki Inaba, Ryoichi Murakami and introduced by Alex Bellos is published in English by The Experiment Publishing on October 3, 2017. 

To solve each puzzle, remember these simple rules:

• ​Area = Length x Width
• Use spatial reasoning to find helpful relationships (diagrams are NOT drawn to scale!)

Whole numbers are all you need. All of the problems can be solved without using fractions.

FiveThirtyEight's "The Riddler" column by Oliver Roeder featured two puzzles from The Original Area Mazes on September 22, 2017. Here they are below. See if you can solve them! 
(A video in which Roeder explains how to solve both puzzles was released the next week!)

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Riddler "Express"

Puzzle © 2011, 2017 Naoki Inaba

Riddler "Classic"

Puzzle © 2011, 2017 Naoki Inaba

Did you solve them? Here's a link to the The Riddler Oliver Roeder's video explaining the solution: