Question

Help 50 points please show your work
DUE TODAY

Answer 1

3. 72 questions

4. 180 students

5. 120 students

6. 9 puzzles

Explanation:

Question 3

`\begin{aligned}\implies \rm 80\% \;of \; 90 \; questions & =80\% * 90\\&= (80)/(100) * 90\\& = (7200)/(100)\\& = 72\end{aligned}`

Therefore, a student must answer 72 questions correctly to pass the test.

Question 4

`\begin{aligned}\implies \rm 40\%\; of\; 450\; students & = 40\% * 450\\& = (40)/(100) * 450\\& = (18000)/(100)\\& = 180\end{aligned}`

Therefore, at least 180 students must plan to attend in order for the school to have the festival.

Question 5

`\begin{aligned}\implies \rm 40\% \; of \; 300 \; students & = 40\% * 300\\& = (40)/(100) * 300\\& = (12000)/(100)\\& = 120\end{aligned}`

Therefore, 120 students chose recycling.

Question 6

If 55% of 20 puzzles are completed, then 45% of 20 puzzles are left to complete, since 100% - 55% = 45%.

`\begin{aligned}\implies \rm 55\% \; of \; 20 \; puzzles & = 45\% * 20\\& = (45)/(100) * 20\\& = (900)/(100)\\& = 9\end{aligned}`

Therefore, Magdalena has 9 puzzles left to complete.