A jar contains 54 marbles, each of which some are blue, some are green

1.	A jar contains 54 marbles, each of which some are blue, some are green and some are white. The probability of selecting a blue marble at random is 1/3 and the probability of selecting a green marble at random is 4/9. How many white marbles does the jar contain?
Answer» Total number of marbles = 54 let x be the number of white marbles in the jar. P (getting a white marble) = x/54 There are 3 types of marbles in the jar, blue, green and white. P(getting a blue ball) + P(getting a green ball) + P(getting a white ball) = 1 (Because sum of probability = 1) 1/3 + 4/9 + x/54 = 1 (54 – x)/54 = 7/9 x = 12 There are 12 white marbles in the jar.

A jar contains 54 marbles, each of which some are blue, some are green and some are white. The probability of selecting a blue marble at random is 1/3 and the probability of selecting a green marble at random is 4/9. How many white marbles does the jar contain?

Answer»

Total number of marbles = 54

let x be the number of white marbles in the jar.

P (getting a white marble) = x/54

There are 3 types of marbles in the jar, blue, green and white.

P(getting a blue ball) + P(getting a green ball) + P(getting a white ball) = 1

(Because sum of probability = 1)

1/3 + 4/9 + x/54 = 1

(54 – x)/54 = 7/9

x = 12

There are 12 white marbles in the jar.

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A jar contains 54 marbles, each of which some are blue, some are green and some are white. The probability of selecting a blue marble at random is 1/3 and the probability of selecting a green marble at random is 4/9. How many white marbles does the jar contain?

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