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Quantitative Aptitude

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A box contain...

Question

A box contains 50 coloured stones What is the total number of orange stones in the box if the probability of selecting an orange stone is 0.4

A

20

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B

0

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C

10

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D

40

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Solution

The correct option is A 20
Let the total number of orange stones in the box be x
Then P(orange) = $\frac{x}{50}$
Given $\frac{x}{50} = 0.4 \Rightarrow x = 20$

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