Question

There are 10 red marbles and some white marbles in a box. If the probability of drawing a red marble is half of the probability of drawing a white marble, then the number of white marbles is

Answer 1

Answer:

let no of white marbles be x

total no of marble is 10+X

p(red marble)=1/2p(white marble)

10/10+X=1/2(X/X+10)

then ans is X=20

hence no. of White marbles is 20

Step-by-step explanation:

i guess this will help

Answer 2

Answer:

20

Step-by-step explanation:

1/2probability of getting white marbles = prob. of getting red marbles

i.e.

1/2 (white balls /all balls) = 10/ all balls

take total no of balls to the right hand side

1/2 white balls = ( 10/tot. balls) x tot balls

1/2 white balls = 10

white balls = 2(10)

white balls = 20

proof ....

1/2 (20/30) = 1/2 * 2/3 = 1 / 3 = 10/30

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