The number of people that are below 20 years is 60.
A box plot is used to study the distribution and level of a set of scores. The box plot consists of two whiskers and a box. The first line on the box represents the upper quartile. 25% of the observation is below the upper quartile.
In this question, the upper quartile is 20 years
Number of people under 20 years : (25 / 100) x 240 = 60 people
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