Pencil writing riddle

A boy presses a side of a blue pencil to a side of a yellow pencil, holding both pencils vertically. One inch of the pressed side of the blue pencil, measuring from its lower end, is smeared with paint. The yellow pencil is held steady while the boy slides the blue pencil down 1 inch, continuing to press it against the yellow one. He returns the blue pencil to its former position, then again it slides down 1 inch. He continues until he has lowered the blue pencil 5 times and raised it 5 times- 10 moves in all.

Supposed that during this time the paint neither dries nor diminishes in quantity. How many inches of each pencil will be snared with paint after the tenth move?

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SherlockHolmes Expert Asked on 19th March 2019 in Logic Puzzles.
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  • 1 Answer(s)

    6 inches

    Yodha Expert Answered on 19th March 2019.
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