Question

A bag contains only red and blue marbles. Yasmine takes one marble at random from the bag. The probability that she takes a red marble is 1 in 5. Yasmine returns the marble to the bag and adds five more red marbles to the bag. The probability that she takes one red marble at random is now 1 in 3. How many red marbles were originally in the bag?

10 red

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Answer 1

Answer:

Solution:

Let the red marbles be x

$\bf\blue{ = \frac{possibility \: of \: red \: marbles }{total \: no \: of \: marbles} }$

$= \frac{1}{5}$

Total Number of Marbles Originally - 5x

Again,

Five More marbles added of Red colour -

$posibility = \frac{1}{3}$

$\frac{x + 5}{5x + 5} = \frac{1}{3} \\ \\ 3x + 5 = 5x + 5$

$x = 5$

Hope it will be helpful :)...✍️

Answer 2

Answer:

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