Question

A bag contains 4 white and some red balls. If the probability
drawing a red ball is double that of drawing a white ball, find
number of red balls in the bag​

Answer 1

Answer:

6

Step-by-step explanation:

Let the no. of red balls be x

white balls = 4

Total balls = 4+x

Probability of getting white ball $=\dfrac{\text{no. of white balls}}{\text{Total no. of balls}}$

$=\dfrac{4}{4+x}$

We are given that the probability of drawing a white ball from the bag is 2/5

So, $\dfrac{2}{5}=\dfrac{4}{4+x}$

$8+2x=20$

$2x=12$

$x=6$

Hence the number of red balls in the bag is 6

Answer 2

Hi

Let the no of red ball be x so

2/5=4/x+4

8+4x=20

2x=20-8=12

x=12/2=6

No of red ball is 6

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