The number of blue marbles in the bag is 18.
Probability determines the chances that an event would happen. The probability the event occurs is 1 and the probability that the event does not occur is 0.
Probability of choosing a green marble = total number of green marbles / total number of marbles
0.55 = 22/x
x = 22 / 0.55
x = 40
Total number of blue marbles = 40 - 22 = 18
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