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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.


  1. 21

  2. 10

  3. 9

  4. 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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