Answer:
4:2:3
Step-by-step explanation:
First you need to divide each number by a common factor like 2.
1. 16:8:12
Divide all numbers by two
8:4:6
Divide by two again
Since, you cannot simplify all of them again, the asnwer is
Blue : Green : Red
16 : 8 : 12
4 : 2 : 3
