Answer: 3:5
Explanation:
Total number of fish = 32
Given that 12 are blue and the rest green
Number of green will be 32 - 12 = 20
Ratio of blue to green fish = number of blue fish : number of green fish
= 12:20
Therefore, to put 12:20 in the simplest form, we divide by a common factor of 4
= 12/4 : 20/4
= 3:5