Thinky Riddle

There are 9 jars filled with 100 marbles each. 8 of the 9 jars are filled with 1 gram marbles. The other jar is filled with 1.1g marbles. There is a scale with an empty jar. You are allowed to fill the empty jar with any amount of marbles from the 9 jars one time. The weight will only be calculated when you are done putting the marbles in. How do you discover which jar is filled with 1.1g marbles?

This entry was posted on Thursday, November 1st, 2007 at 10:31 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “Thinky Riddle”

  1. Thinky McThinker Says:
    November 2nd, 2007 at 1:15 pm

    Take 1 from the first jar, 2 from the next, etc. and then 10 from the 10th. Sum the marbles. You will get a mass of 55 + .5*N, where N is the jar with the 1.1 gram marbles.

    FIRST.

  2. Stinky McStinker Says:
    November 5th, 2007 at 10:50 pm

    Nice, mr. spoilsport sir
    Not like it was hard! :)

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