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Description
The Price of CakeBy: Clment Deslandes, Guillaume Deslandes Illustrator: Laure Mac de Lpinay Ingeniously designed mathematical riddles to delight armchairand seasonedmathematicians, in high school and beyond. In The Price of Cake, brothers Clment and Guillaume Deslandes have assembled a uniquely rich and accessible collection of mathematical riddles, organized by difficulty and accompanied by unique hand drawn illustrations. The challenges are exceptional in both their
By: Clément Deslandes, Guillaume Deslandes | Illustrator: Laure Macé de LépinayIngeniously designed mathematical riddles to delight armchair—and seasoned—mathematicians, in high school and beyond.
In The Price of Cake, brothers Clément and Guillaume Deslandes have assembled a uniquely rich and accessible collection of mathematical riddles, organized by difficulty and accompanied by unique hand-drawn illustrations. The challenges are exceptional in both their range and their precision. There are no “tricks” here—just good math to test your skills.
While any student will be thrilled to encounter fresh presentations of classic conundrums such as Simpson’s paradox, Hilbert's infinite hotel, Monty Hall’s paradox, and Seven Bridges of Königsberg, seasoned solvers will also appreciate challenging original puzzles using the Axiom of Choice and Conway’s Soldiers problem. The Deslandes’ lucid and elegant solutions offer new insights, as they seamlessly connect the skills applied in each problem to broader theoretical revelations. Moreover, as Fields Medalist Cédric Villani writes in his preface, these riddles are much more than just exercises. They capture “a certain dose of decorum and mystery,” and to decipher them will require both imagination and tenacity.
To aid you on this journey, the authors provide hints to each puzzle, detailed proofs and solutions, and a series of Math Refreshers to revisit important concepts that are used to arrive at those answers. Entertaining and rigorous in equal measure, The Price of Cake is bound to captivate mathematics enthusiasts and students of all levels.
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4.2 ★★★★★
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Product Reviews
★★★★★ 5
The SCRUB
Color: 2 Pack
Perfect amount of abrasion for a mans skin. Gets all the dead skin off, without leaving red marks. it does eat your soap faster, but that just means you're cleaner or something, right? Anyway, great product, came as expected, didn't fall apart yet after a month of use. Very easy to use just throw your soap bar in there, and leave it in a wire basket to dry off after your shower.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Smooth Skin
Color: 2 Pack
Very happy with these soap bags. Once it's wet it puffs up quite a bit which makes it easy to handle as your larger your skin. My skin feels so smooth, especially my feet...feels as if I'd just had a pedicure.
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Reviewed in the United States on May 9, 2026
★★★★★ 5
Scrub excellence
Color: 2 Pack
Love a good natural material, I feel like it's really maximizing use of my soap bar, and it's a scrubby and exfoliating feeling everytime that I shower. Definitely recommend.
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Reviewed in the United States on April 23, 2026
★★★★★ 4
Great natural exfoliation and keeps soap longer
Color: 2 Pack, Color: 2 Pack
I really like these Dewlavelle soap bags made from natural Egyptian loofah. They’re a simple idea, but they work really well in the shower. Just place your bar soap inside, wet it, and it creates a rich lather while gently exfoliating your skin.
Pros:
Natural loofah material gives great exfoliation without being too harsh
Creates a nice, rich foam with bar soap
Helps use up small leftover pieces of soap instead of wasting them
Dries quickly between uses
Long hanging loop makes it easy to hang in the shower
Comes in a convenient 2-pack
Cons:
Texture may feel a little rough for very sensitive skin
Needs to be rinsed and hung to dry to keep it fresh
Overall, these are a great addition to a shower routine. They help your soap last longer and give your skin a nice exfoliating cleanse at the same time. Great value for a natural product.
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Reviewed in the United States on March 17, 2026
★★★★★ 5
Genius!! Clean and exfoliate!
Color: 2 Pack
I will tell you that this was a just looking find and I'm so happy I did. It's better than the rest of the fluffy stuff. It get to the real reason for bathing clean and exfoliate. Im able to insert my tallow all over body soap, suds right up, it doesnt tallow the soap to resolve and I can hang to my motorhome shower wall. I ordered one set and ordered a second soon after for my home shower. I recommend 💯!
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Reviewed in the United States on March 25, 2026
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