The total is 12+15 = 27. Therefore the girls represent 12/27 of the total. You can simplify the fraction if you so wish.
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If the ratio of boys to girls is 12 to 3, then the total ratio is 12 + 3 = 15. To find how many girls are in the class, we divide the number of girls by the total ratio, 24 / 15 = 1.6. This means there are approximately 1.6 girls in the class. However, since we can't have a fraction of a girl, we can conclude that there are 2 girls in the class.
15:18 It can also be written as a fraction 15/18 Because there are 15 girls and 18 boys
10 to 15 or 2 to 3 even
It is 15/12
12/15 = 4/5.