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

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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