A bag contains red and blue balls. If the total number of balls is 30 and 30% are red. Find the number of blue balls.

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A
21

Total number of balls = 30
Total number of red balls = 30% of the total balls = $30 \times \frac{30}{100}$ = 9 balls
Therefore total number of blue balls = total number of balls - total number of red balls = 30 - 9 = 21balls

Suggest Corrections

Similar questions

A bag contains red and blue balls. If the total number of balls is 30 and 30% are red. Find the number of blue balls.

Q. A bag contains

21

blue balls and

32

green balls. If

43

red balls are added to the bag, what will the total number of balls in the bag be?

Q. A bag with total

10

balls contains

x

blue and

y

red balls. If the number of blue balls is four times the number of red, then write the two equations.

A bag contains $5$ red balls and some blue balls. If the probability of drawing a blue ball is double that of red ball, find the number of blue balls in the bag.

There are 30 balls in a bag which are either red or blue in colour. 50% of them are red balls. Calculate the number of red and blue balls.

Join BYJU'S Learning Program

A bag contains red and blue balls. If the total number of balls is 30 and 30% are red. Find the number of blue balls.

The correct option is A 21 Total number of balls = 30 Total number of red balls = 30% of the total balls = 30×30100 = 9 balls Therefore total number of blue balls = total number of balls - total number of red balls = 30 - 9 = 21balls

The correct option is A
21

Total number of balls = 30
Total number of red balls = 30% of the total balls = $30 \times \frac{30}{100}$ = 9 balls
Therefore total number of blue balls = total number of balls - total number of red balls = 30 - 9 = 21balls