quesito difficile test ingresso?

se quattro operatori allestiscoo in laboratorio nove colture cellulari in venti minuiti, quanti operatori sarebero teoricamente necessari per allestire 90 culture cellulari in 100 minuiti.

a 40

b 4

c8

d 16

Update:

grazie a tutti..ma non riesco a capire ilprocedimento

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