Question

# 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.21 10 9 24

Solution

## The correct options are 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

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