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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.


A

21

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B

10

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C

9

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D

24

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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 = 30×30100 = 9 balls
Therefore total number of blue balls = total number of balls - total number of red balls = 30 - 9 = 21balls


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