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The total is 12+15 = 27. Therefore the girls represent 12/27 of the total. You can simplify the fraction if you so wish.
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.
3 to 4
There is 23 girls and 12 boys
Oh, honey, if you've got 48 students in your class and 12 more girls than boys, that means there are 30 girls and 18 boys. Math doesn't lie, sweetie, so those are your numbers. Now go conquer that classroom like the boss you are!