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Thursday, October 20, 2011

Brain Puzzler: "A Class Act"

There are thirty students in a class.  Five of these students do not play any sort of musical instrument.  Among the others, eighteen students play guitar.  Six of these guitar players also play keyboards.

How many of the students in the class play only keyboards?

Hint :A Venn Diagram can be a helpful tool to solve this problem.
from Critical Thinking Puzzles by Michael A. DiSpezio


Click here to check your answer
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11 comments:

  1. Declan OOctober 21, 2011 at 9:35 AM

    12 play the keyboard.

    ReplyDelete
  2. Mr. BaumgarnerOctober 24, 2011 at 8:20 AM

    Good Try, but incorrect. Here's another hint: The class can be divided into 3 categories. Use the Venn Diagram to sort those categories.

    ReplyDelete
  3. karly.rOctober 25, 2011 at 6:02 PM

    23 Play the keyboard.

    ReplyDelete
  4. karly.rOctober 25, 2011 at 6:07 PM

    7 Play the keyboard.

    ReplyDelete
  5. delaney.lOctober 26, 2011 at 2:10 PM

    why did the 7 sate 11 bcause it was stoped.

    ReplyDelete
  6. Ryan LOctober 26, 2011 at 2:22 PM

    This comment has been removed by a blog administrator.

    ReplyDelete
  7. Ryan .LOctober 27, 2011 at 9:30 AM

    I would think 4 at least.

    ReplyDelete
  8. JohnnyD.October 27, 2011 at 9:33 AM

    About 4.

    ReplyDelete
  9. Ryan L.October 27, 2011 at 4:41 PM

    Maby 34 or 5 at the most

    ReplyDelete
  10. Ryan.LNovember 2, 2011 at 11:03 AM

    Maby 10

    ReplyDelete
  11. Declan O.November 30, 2011 at 11:01 AM

    7 play the keyboards.12 play the guater

    ReplyDelete

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