Question

A bag contains 5 pencils and some pens. If the probability of drawing a pen is double that of a pencil, find the number of pens in bag. plz give full solution:

Answer 1

Answer:

Step-by-step explanation:we know that number of pencil is 5.

So take no of pens as x.

Y is sum of x and y

5+x=y

And it is also said that

Number of pens are double of number of pens.

So =2×5=x

X=10

Hence probability of pen comong is 10÷15= 2÷3=33.333

Answer 2

Answer:

probability of drawing a pen is 10

Step-by-step explanation:

Let there be x no of pens in the bag

Therefore,

Total number of pens in the bag=( x+5)

Now,

P1=Probability of drawing a pen=x/5+x

P2=Probability of drawing a pencil =5/5+x

According to the question

P1=2×P2

x/5+x=2×5/(5+x)

cross multiple each other we get

x(5+x)=10(5+x)

x=10

Therefore the probability of getting a pen is 10