Question

30 seventh graders participate in school play. Of the students in seventh grade 60% are not participating, how many students are not participating?

Answer 1

45 students are not partticipating

Step-by-step explanation:

Number of students that participated in school play = 30

% of students not participating = 60%

% of those participating = 100% - 60%

% of those participating = 40%

let the total number of students in 7th graders = y

Number of students that participated in school play = total number of students in 7th graders × % of those participating

30 = y × 40%

30 = y × 0.4

30 = 0.4y

divide both sides by 0.4:

`\begin{gathered} (30)/(0.4)\text{ = }(0.4y)/(0.4) \\ y\text{ = 75} \end{gathered}`

Number of students not participating = total number of students in 7th graders - Number of students that participated in school play

Number of students not participating = 75 - 30

Number of students not participating = 45