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A bag contains red and white balls only. If the probability of drawing a red ball is $\frac{2}{5}$ and there are 12 white balls, how many red balls are there?

Class 10Probability Word ProblemsStatistics

A8
B16
C7
D9

Step-by-Step Solution

P(red) =

\frac{2}{5}

means P(white) =

\frac{3}{5}

. If

\frac{3}{5}

of total = 12, total = 20, so red = 20 - 12 = 8.

Answer: A) 8

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