Determine the Number of Blue Marbles
A jar is filled with marbles which contains 27 red, 87 yellow and rest are blue marbles. If the probability of getting a blue marble is 2/5 how many blue marbles are there?
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let the blue marbels be x
x/(27 + 87 + x) = 2/5.
5x = 2(114 + x).
5x = 228 + 2x.
5x - 2x = 228.
3x = 228.
x = 76.
Number of blue marbles are 76.
x/(27 + 87 + x) = 2/5.
5x = 2(114 + x).
5x = 228 + 2x.
5x - 2x = 228.
3x = 228.
x = 76.
Number of blue marbles are 76.
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1
blue marbles are 76..................
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