Question 91

A rainy day occurs once in every 10 days. Half of the rainy days produce rainbows. What percent of all the days do not produce rainbow?

Solution

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Let total number of days=20x

Number of rainy days = 2x

Number of rainbow days = x

Number of non rainbow days= 19x

$$\therefore\ $$ Percentage of non rainbow days = $$\frac{19x}{20x}\ \cdot\ 100\ =95$$

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