Question 1:
Sandy had an exam and answered 216 questions correctly. There were 300 questions. What is her score?
Answer:
[tex]\frac{216}{300}[/tex] x 100% = 72%
Question 2:
Tommy's phone can only last 5 hours when it's fully charged. One day, he used his phone for 1 hour 24 minutes. Assuming that his phone's battery drains linearly against usage time, what is the percentage of the phone's battery left?
Answer:
Phone usage time = 1 hour + 24minutes
By converting 24 minutes to hour, we have 0.4 hours
Therefore total phone usage time is 1 + 0.4 hours = 1.4 hours
Percentage of hours used = [tex]\frac{1.4}{5}[/tex] x 100% = 28%
Since he used 28%, his phone's battery should have 72%.
We can calculate it by 100% - 20% = 72%
