Respuesta :
12 is the greatest number because it is the highest common factor between the three numbers.
find greatest common factor
36=2*2*3*3
48=2*2*2*2*3
72=2*2*2*3*3
common factor is 2*2*3=12
he can use 12 to divide
36=2*2*3*3
48=2*2*2*2*3
72=2*2*2*3*3
common factor is 2*2*3=12
he can use 12 to divide