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Posted by on Sunday, April 24, 2011 at 5:12pm.

In a bag there are 7 red tiles, 3 blue tiles, and 2 purple tiles. How many and what color tiles would you have to add to the bag so that the probability of picking red is 1/3?

  • Probability as a Fraction - , Sunday, April 24, 2011 at 5:14pm

    you want red to be 1/3, you have 7 to choose from, so you want probability to be 7/21. YOu have 12, how many more non red tiles would you add to make 21?

  • Probability as a Fraction - , Sunday, April 24, 2011 at 5:17pm

    12 in bag now
    7/12 are red which is more than 1/3

    Say we add x blue tiles
    then
    7/(12+x) = 1/3

    12 + x = 21
    x = 9
    so add 9 blue tiles for example
    check
    7 red
    12 blue
    2 purple
    that is 21 total
    7/21 = 1/3 check

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