We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.

+0

# Class period

0
296
2

Ten percent of the class period was spent taking roll and making announcements. If there were 45 minutes that remained, how long is the class period?

Show answer but also explain it plz so I understand it

Jan 31, 2018

### Best Answer

#1
+3

Let's call the length of the class period  " p ".

From the problem statement, we can make this equation:

p  -  10%  of  p   =   45 minutes

p  -  0.1p   =   45 minutes

0.9p   =   45 minutes      (In other words, 90% of the class period is 45 minutes.)

Divide both sides of the equation by  0.9 .

p   =   45 / 0.9 minutes

p   =   50 minutes Jan 31, 2018

### 2+0 Answers

#1
+3
Best Answer

Let's call the length of the class period  " p ".

From the problem statement, we can make this equation:

p  -  10%  of  p   =   45 minutes

p  -  0.1p   =   45 minutes

0.9p   =   45 minutes      (In other words, 90% of the class period is 45 minutes.)

Divide both sides of the equation by  0.9 .

p   =   45 / 0.9 minutes

p   =   50 minutes hectictar Jan 31, 2018