Question

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.

• A. 15 red balls
• B. 10 red balls
• C. 15 blue balls
• D. 20 blue balls

Answer 1

Answer: (A), (C)

The correct options are
A

15 red balls

C

15 blue balls

Total number of balls = 30
Total number of red balls = 50% of the total balls = $30\times \frac{50}{100}$ = 15 balls
$\therefore$ Total number of blue balls = Total number of balls - Total number of red balls
$\Rightarrow$ Number of blue balls = 30 - 15 = 15 balls