1110 students at school, 230 of them are boys.if each classroom holds 30 students.how many classroom are needed at school.

1110 / 30 = ?

To find out how many classrooms are needed at the school, we need to divide the total number of students by the capacity of each classroom.

First, let's find the number of girls in the school:
Total number of students - Number of boys = Number of girls
1110 - 230 = 880

Next, we will calculate the total number of students per classroom:
Number of boys per classroom + Number of girls per classroom = Total number of students per classroom
30 (boys) + 30 (girls) = 60 students per classroom

Finally, we can find the number of classrooms needed:
Total number of students ÷ Total number of students per classroom = Number of classrooms needed
1110 ÷ 60 = 18.5 classrooms

Since we cannot have a fraction of a classroom, we round up to the nearest whole number.

Therefore, the school will need 19 classrooms.