The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.

   

The Forgetful Builder

You've just purchased your first new home. When you arrive to beginning moving in, you discover that the builder forgot something. Being a self-reliant sort of person, you decide to finish the job yourself. You stroll down to the local hardware store and find exactly what you need at a price you can afford. The hardware store charges perfectly reasonable prices for the items; 7 will cost $1.00, 10 will cost $2.00, and 100 will cost $3.00. As it happens, you need 880, which also costs $3.00.

These items could likely be found at any hardware store, and at your average home.

What did the builder forget?


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