Number of total marble is 36
Assume;
Number of total marble = a
Number of red marble = (1/2)a
Number of white marble = (1/3)a
Number of blue marble = 6
So,
Number of total marble = Number of red marble + Number of white marble + Number of blue marble
(1/2)a + (1/3)a + 6 = a
a/2 + a/3 + 6 = a
(3a + 2a + 36) / 6 = a
5a + 36 = 6a
a = 36
Number of total marble = 36
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