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Description
Puzzle Box, Volume 1Multiplying my age by 6 then subtracting 6 produces the same result as subtracting 7 from my age then multiplying by 7. How old am I? On my broken calculator with keys ] x =, the only functional number is 7. How can I get 34 to appear in the readout? A country mints four denominations of coins, in whole numbers of cents. It takes four of these coins to make 21 , or 24 , or 25 , or 26 . What are the denominations of the coins? These and almost 300
Multiplying my age by 6 then subtracting 6 produces the same result as subtracting 7 from my age then multiplying by 7. How old am I?On my broken calculator with keys ] - x =, the only functional number is 7. How can I get 34 to appear in the readout?
A country mints four denominations of coins, in whole numbers of cents. It takes four of these coins to make 21 , or 24 , or 25 , or 26 . What are the denominations of the coins?
These and almost 300 other mathematical puzzles appear in this original collection, devised by world-renowned mathematicians, puzzle creators, and devoted puzzle lovers. A unique puzzle project, it unites the efforts of a dozen authors, including software engineer Andrea Gilbert and Bram Cohen, author of the P2P BitTorrent protocol.
Seventeen different types of challenges include 3-D puzzles, chess puzzles, connections, dissections, foldings, geometrical puzzles, logic problems, matchstick puzzles, mazes, moving pieces, number puzzles, put-togethers, strimko, sudoku, visual puzzles, weightings, and word puzzles. The difficulty level of each puzzle is marked by stars, ranging from 2 to 5. Average difficulty level is about 3 stars, promising puzzle enthusiasts many entrancing hours of solving and enjoyment.
Binding Type: Paperback
Publisher: Dover Publications
Published: 11/16/2016
ISBN: 9780486810041
Pages: 96
Weight: 0.60lbs
Size: 10.90h x 8.20w x 0.20d
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★★★★★ 5
Works well
Size: 6 Fl Oz (Pack of 1)
Always great sun protection
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Reviewed in the United States on May 29, 2026
★★★★★ 5
Great Sunscreen
Size: 3 Fl Oz (Pack of 2)
I love this sunscreen and have been using it for years! The scent is pleasant, and it goes on smoothly and provides great coverage. It doesn’t leave a greasy feeling after application, which I really appreciate. It also holds up well after being in the water, and I like that it's environmentally friendly.
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Reviewed in the United States on May 26, 2025
★★★★★ 4
Not for Oily / Combo skin types
Size: 3 Fl Oz (Pack of 2)
The product smells nice, doesn't leave a greasy feeling on my skin. It's easy to spread and seeps right into my skin. I've had bad luck with sunscreens and so far this one has been nice on my sensitive skin.
The quality of the bottles is odd, or at least that was my first impression. It feels cheap. Maybe that's just how this product is.
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****EDIT: I made this review back when my "skin care routine" consisted on NOTHING but salicylic acid cleanser and this sunscreen every other day, whenever I remembered to apply it. My skin was DRY and this sunscreen felt like heaven when applied on my screen.
I recently started actually looking after my skin and added a moisturizer and retinol to my routine. My skin is now hydrated and soft. Now, I'm having to switch to a different sunscreen because this one can no longer be fully absorbed by face. It leaves a nice glow but also an unfortunate greasy feeling on my skin. I also forgot to point our last time that it does leave a white cast, but it goes away after a few extra seconds of rubbing it in.
I still think this is a good product! Just make sure you have the right skin type (dry) for it.
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Reviewed in the United States on January 9, 2023
★★★★★ 5
Great lotion
Size: 3 Fl Oz (Pack of 2)
Our favorite sun tan lotion. Works great and goes on light.
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Reviewed in the United States on April 16, 2026
★★★★★ 5
Quality
Size: 3 Fl Oz (Pack of 2)
My favorite body sunscreen. No insane sunscreen smell, not super greasy, and it works well on fair skin.
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Reviewed in the United States on October 11, 2025