Calculate the values of the ratios.

a) [[$ 12 $]] cm [[$ : 5 $]] m



The value is .

b) [[$ 3 $]] kg [[$ : 210 $]] g



The value is .

c) [[$ 15 $]] min [[$ : 1 $]] h



The value is .

d) [[$ 70 $]] mm [[$ : 0.5 $]] m



The value is .