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

only 10/60 isn't equivalent

hope this : )

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72