# A jar contains 24 marbles, some are green, and others are blue. If a marble is drawn at random from the jar, the probability that it is green is 2/3. Find the number of blue balls in the jar

**Solution:**

We use the basic concepts of linear equations and the basic formula of probability to solve the problem.

Total number of marbles = 24

Let the number of green marbles be x and the blue marbles be 24 - x

Probability of getting green marbles = 2/3

Number of possible outcomes / Total number of outcomes = 2/3

x/24 = 2/3

x = (2/3) × 24

x = 16

Therefore, the number of green marbles = 16

Hence, total number of blue marbles = 24 - x

= 24 - 16 = 8

Thus, the number of blue marbles is 8.

Check out more on terms of probability.

**☛ Check: **NCERT Solutions for Class 10 Maths Chapter 15

**Video Solution:**

## A jar contains 24 marbles, some are green, and others are blue. If a marble is drawn at random from the jar, the probability that it is green is 2/3. Find the number of blue balls in the jar.

NCERT Solutions for Class 10 Maths Chapter 15 Exercise 15.2 Question 5

**Summary:**

If a jar contains 24 marbles, some are green and others are blue and if marble is drawn at random from the jar, and the probability that it is green is 2/3, then the number of blue marbles in the jar is 8.

**☛ Related Questions:**

- Two customers Shyam and Ekta are visiting a particular shop in the same week (Tuesday to Saturday). Each is equally likely to visit the shop on any day as on another day. What is the probability that both will visit the shop on (i) the same day? (ii) consecutive days? (iii) different days?
- A die is numbered in such a way that its faces show the numbers 1, 2, 2, 3, 3, 6. It is thrown two times and the total score in two throws is noted. Complete the following table which gives a few values of the total score on the two throws:What is the probability that the total score is (i) even? (ii) 6? (iii) at least 6?
- A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag.
- A box contains 12 balls out of which x are black. If one ball is drawn at random from the box, what is the probability that it will be a black ball?If 6 more black balls are put in the box, the probability of drawing a black ball is now double of what it was before. Find x.