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12 grades and you would be about 20
12
No. They are 9–12 grades.
12
good grades
Tardiness does not necessarily make students get low grades, but it certainly does not help their grades, especially if they are tardy repeatedly.
20
6x2=12 12+8=20 20+4=24
How many 20s make 270
In the United States, "secondary school" usually refers to a school that combines middle and high school grades (usually grades 7-12 or 6-12). These often exist in smaller towns that don't really have enough students to make two separate schools for the middle and high school kids. A school with grades 9-12 is just called a high school.
6-12
12 + 24 * 6/18 = 12 + 24 *1/3 = 12 + 8 = 20