Question

The age distribution of people entering a Museum X is shown in the pie graph above. If number of people that are above $20$ years and entering the museum are $553$, then find approximately how many people entered the museum?

Answer 1

Let the total number of people be $N$.

Then the number of people having an age of $20$ years or above is

$0.19N+0.27N+0.25N+0.08N=553$

$\Rightarrow 0.79N=553$

$\Rightarrow N=700$

Hence, the total number of people entering the museum on that day is $700$.