Respuesta :

18 supervisors are needed.

42 children for 3 adults to supervise:

First, we have to divide the number of children by the number of supervisors:

42/3 = 14 children for each supervisor.

Then we have to divide the new number of children (252) by the number of children that each supervisor supervises.

252 /14 = 18 supervisors.

RELAXING NOICE
Relax