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.

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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

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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