Question

The probability of choosing a blue marble is 1/5 and prabability of choosing a black marble is 1/4 if there are 11 green marbles find the total no. of marbles

Answer 1

Answer:

Step-by-step explanation:x= total outcomes

P(e) of getting green marbles = 11/x

11/x = 1-(1/5+1/4)

11/x = 1-(5+4/20)

11/x = 1-9/20

11/x = 20-9/20

11/x = 11/20

X= 20

Total marbles r 20

Hope it works

Answer 2

The total number of marbles are 20.

Step-by-step explanation:

Since we have given that

Probability of choosing a black marble = $\dfrac{1}{4}$

Probability of choosing a blue marble = $\dfrac{1}{5}$

So, Remaining probability would be

$1-(\dfrac{1}{5}+\dfrac{1}{4})\\\\=1-\dfrac{4+5}{20}\\\\=1-\dfrac{9}{20}\\\\=\dfrac{20-9}{20}\\\\=\dfrac{11}{20}$

Number of green marbles = 11

So, According to question,

$\dfrac{11}{x}=\dfrac{11}{20}\\\\x=20$

Hence, the total number of marbles are 20.

# learn more:

If probability of getting a blue marble is 1/5 and of black is 1/4 if green marbles are 11 find total number of marbles

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