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HampsterHank
i dont know if there is any more but
 it would be 12/12
or 3/5
 i dont know what you want me to explain the meaning of but i think that means that there are 12 kids to 20 adults hope it helps
howabouttomorrow
12:20 simplified is 3:5 
3:5 means that with every 3 children there are 5 adults.