Find the minimum number of people...(Numerical Reasoning Test Question)

[cruxxfay]

Please find the attached for the question. It is one of the practice question of a numerical reasoning test.

Preferably I would like some advice on how to approach this question because I would like to do it myself, but as of now I have no idea where to start...

Thanks in advance!

 

[stapel]

The image is too small for me to read the text. Please reply with a typed-out version of the exercise. Thank you!