Can You Detect the Counterfeit Cash?

Picture: Photograph: Shutterstock Graphics: Vicky Leta

Welcome to the primary Gizmodo Monday Puzzle, a brand new sequence through which I’ll pose thought-provoking challenges in the beginning of each week to jumpstart your mind. I’m a lifelong puzzle lover, someday puzzle creator, and new Gizmodo puzzle author. Lots of the teasers posted right here will probably be troublesome—however they are going to be solvable by the persistent amongst you, with out the necessity for specialised information or higher-level math. Some will probably be classics from the puzzle world, and plenty of will probably be lesser-known gems. They won’t be gimmicky, which means that what the puzzle appears to be asking actually is what it’s asking. And eventually, they are going to be influenced by you! If you understand an amazing puzzle that you simply suppose must be coated right here, ship it my means: [email protected].

To kick off the sequence, I’ve chosen an outdated favourite through which you’ll attempt to keep away from being ripped off by making intelligent use of a scale. It hits the candy spot, difficulty-wise. The answer is not going to be instantly apparent to most individuals, and but in the event you chew on it for a short while, readability will come. Talk about your ideas brazenly within the feedback part, however be warned that spoilers would possibly lurk there. If you happen to’ve heard this puzzle earlier than, I ask that you simply not submit the answer and as a substitute give a contemporary solver an opportunity to be first. Good luck!

Puzzle #1: 10 Baggage of Cash

You will have 10 baggage; every bag comprises 10 cash. In 9 of the baggage, each coin weighs precisely 1 gram. Nevertheless, one of many baggage holds counterfeit cash, which weigh 1.1 grams apiece. You don’t know which bag comprises the false cash, and the load distinction is simply too refined to really feel along with your palms. Fortunately, you have got a scale to assist. It shows a exact and correct numeric readout (for instance, in the event you positioned a raisin on the size, it would show: “.58 grams”). Not so fortunately, the size’s battery is dying and after one use it’s going to conk out. How are you going to establish the bag with the heavier cash utilizing solely a single weighing on the size? You’re allowed to take cash out of their baggage, however you solely get to learn one quantity from the size.


Like many nice puzzles, this sounds inconceivable at first. How can a single quantity present sufficient data to seek out 10 faux cash out of 100? Nevertheless, there’s a stunning and gimmick-free answer that’s only a stroke of perception away.

We’ll submit the answer subsequent Monday, together with a brand new puzzle!

Particular due to Robbie Gonzalez, who beforehand and deftly helmed a weekly puzzle at Gizmodo. I used to be a giant fan of that column and hope that this new incarnation is simply as enjoyable and stimulating.

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