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Byju's Answer
Standard X
Mathematics
Deck of Cards and Probability
A box contain...
Question

A box contains some black balls & 30 white balls. If the probability of drawing a black ball is 2/5th of a white ball, find the number of black balls in the box.


A

6

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B

18

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C

12

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D

42

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E

30

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Solution

The correct option is C

12



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