30 students in a class. 18 are girls. what is the ratio of boys to total number of students in the class?​

2:5

Step-by-step explanation:

there are 12 boys in the class because 30 minus 18 is 12.

so you get a ratio of 12:30

and to simplify it you divide by a common factor which is 6

and you get 2:5

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