8 less than 2/5 of the 9th grade had perfect attendance in the first quarter. If 142 students had perfect attendance how many students are in the 9th grade

In the 9th grade are 375 students

Step-by-step explanation:

To solve this problem we are going to represent the data they give us through an equation

a = perfect attendance = 142

t = total = x

(x * 2/5) - 8 = a

Now that we have the equation we simply have to solve for the x which is what we want to know

(x * 2/5) - 8 = a

(x * 2/5)  = a + 8

x = (a + 8) / (2/5)

Now that we clear the x we replace the values we know (a = 142)

x = (a + 8) / (2/5)

x = (142 + 8) / (2/5)

x = (150) / (2/5)

x = 375

In the 9th grade are 375 students