solve for the missing term encircle the letter of the correct answers please answer!

Answer:
1) 12:16
So the bigger number is 16
2) 20:30
Math books= 20
3) 20:40
Boys= 20
4) 15:25
Red= 15
5) 30:45:75
Banana= 75
Step-by-step explanation:
I hope its help=)