Problema Solution
15 marbles are placed in a bag; some are red and some are blue. If the number of red marbles is 1 more than the number of blue marbles, what is the probability that a marble taken from the bag is blue?
Answer provided by our tutors
Let 'x' the number of blue marbles and 'x + 1' the number of red marbles.
x + (x + 1) = 15
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click here to see the equation solved for x
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x = 7 blue marbles
The probability that a marble taken from the bag is blue is:
P(the marble is blue) = 7/15
P(the marble is blue) = 0.4667