Probability sums

Probability Level 1

There are 7 green balls, 9 purple balls and 100 yellow balls in a big bag. If Ramu took 47 yellow balls from the bag and replace it to green balls , what is the probability that a yellow ball is picked when Cathy randomly picks a ball?

53/116 1/53 16/100 100/116

Parvin Banu by Parvin Banu , 17, Singapore

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

2 solutions

Mohammad Khaza
Feb 8, 2018

total balls= 9 + 7 + 100 = 116 9+7+100=116

yellow balls= 100 − 47 = 53 100-47=53 ................[as it has been exchanged by green balls]

so,the probability to get a yellow ball at a random pick is= 53 116 \frac{53}{116}

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Parvin Banu
Dec 1, 2017
  • Originally , there was 100 yellow balls, but when ramu took 47 yellow balls out of the bag and replace it to green balls, the amount of green balls increased , number of yellow balls decreased. To calculate the number of yellow balls, you should do 100(original number of yellow balls) - 47(ramu took this amount of balls out)= 53(new number of yellow balls)
1 Helpful 0 Interesting 0 Brilliant 0 Confused

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...