Question

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

Answer 1

Answer:

jar contains 12 marbles

Step-by-step explanation:

b+g+w=54

P( selecting a blue marble ) =    b   /54

31= b/ 54  

​b=18

Now,

P( selecting a green marble ) =  4/9

g/54 =  4/9

g=24

Therefore,

18+24+w=54

w=12

Hence, the jar contains 12 white marbles.

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Answer 2

Answer is 12

Solution :

Total number of marbles =54

Probability of selecting a blue marble =4/9.

So , Number of blue marbles

=54×4/9= 24 .

Probability of selecting a green marbles = ,1/3

So, Number of green marbles

= 54×1/3 =18 .

Therefore ,

Number of white marbles

= 54 - ( 24 + 18 )

= 54 - 42 =12

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