Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

A bag contains 5 green balls and few blue balls.  If the probability of drawing a blue ball is twice that of drawing a green ball, find the number of blue balls. 
Asked by pdcavita | 04 Dec, 2017, 09:07: PM
answered-by-expert Expert Answer
begin mathsize 16px style Let space the space number space of space blue space balls space be space straight x. Total space number space of space balls equals 5 space Green space balls space plus space straight x space blue space balls equals 5 plus straight x Now comma straight P left parenthesis Green space ball right parenthesis equals fraction numerator 5 over denominator 5 plus straight x end fraction straight P left parenthesis blue space ball right parenthesis equals fraction numerator straight x over denominator 5 plus straight x end fraction Given space that comma straight P left parenthesis blue space ball right parenthesis equals 2 straight P left parenthesis Green space ball right parenthesis rightwards double arrow fraction numerator straight x over denominator 5 plus straight x end fraction equals 2 open parentheses fraction numerator 5 over denominator 5 plus straight x end fraction close parentheses rightwards double arrow fraction numerator straight x over denominator 5 plus straight x end fraction equals fraction numerator 10 over denominator 5 plus straight x end fraction rightwards double arrow 5 straight x plus straight x squared equals 50 plus 10 straight x rightwards double arrow straight x squared minus 5 straight x minus 50 equals 0 rightwards double arrow straight x squared minus 10 straight x plus 5 straight x minus 50 equals 0 rightwards double arrow straight x left parenthesis straight x minus 10 right parenthesis plus 5 left parenthesis straight x minus 10 right parenthesis equals 0 rightwards double arrow left parenthesis straight x minus 10 right parenthesis left parenthesis straight x plus 5 right parenthesis equals 0 rightwards double arrow straight x equals 10 space or space minus 5 Rejecting space straight x equals negative 5. Hence comma space number space of space blue space balls equals straight x equals 10 end style
Answered by Rashmi Khot | 05 Dec, 2017, 09:15: AM

Concept Videos

Multiple Choice Questions Practice Test Subjective Questions Webinar Subjective Questions Pre Board Assessment
Answered Unanswered My Questions My Answers
CBSE 10 - Maths
a dice is thrown once.find the probability of getting a number lying between 1 and 4.
Asked by kavitajasmine12345 | 02 Jan, 2022, 11:45: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
probability
Asked by plaltarapur | 25 Oct, 2021, 06:56: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
what is a polynomial
Asked by shwetarai12345678910 | 12 Oct, 2020, 06:24: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
A no.x is chosen at random from the numbers -3,-2,-1,0,1,2,3 the probability that x<2 is
Asked by officialmehak26 | 02 Feb, 2020, 08:08: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
what is probability of getting 1 head
Asked by prakharupaddyay | 09 Nov, 2019, 07:36: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
A bag contain number 3 to 102 cards. one card is drawn at a random. Find the probability that it is not a perfect cube number
Asked by Nimmi | 23 Jun, 2018, 11:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
An integer is chosen at random between 1 and 100. Tell me , will the total events be 100 or 98? Because in the question "between" word is used,if the word "from" is used then total events will be100. Kindly tell me the no. of total events.
Asked by prabal | 30 Mar, 2018, 09:39: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
From a pack of 52 playing cards – jacks, queens, kings and aces of red colour are removed. From the remaining, a card is drawn at random. Find the probability that the card drawn is (i) a black queen (ii) a red card (iii) a face card.
Asked by Topperlearning User | 08 Nov, 2017, 01:39: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
What is the probability that a number selected from the numbers 1, 2, 3 ...15 is a multiple of 4?
Asked by Topperlearning User | 08 Nov, 2017, 02:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
In a lottery there are 10 prizes and 25 blanks. What is the probability of getting a prize?
Asked by Topperlearning User | 08 Nov, 2017, 02:27: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt

Be a Top Scorer in the Exam with Test Series and Test Generator!

Enrol Now
×