the ratio is 3:5
what you do is make a fraction out of it (18/30) and then reduce and put a colon in it
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18 boys and 12 girls
The ratio of boys to girls can be calculated by dividing the number of boys by the number of girls. In this case, there are 18 boys and 9 girls, so the ratio would be 18:9. This ratio can be simplified by dividing both numbers by their greatest common factor, which in this case is 9. Therefore, the simplified ratio of boys to girls is 2:1.
3 to 2
In a class of 30, if there are 12 boys then there must be 18 girls. This would make the ratio: 18:12 or 3:2 (girls:boys)
There are 12 boys.