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In a 50 minute class period,78% of the time is spent reading a book. How many minutes are spent reading a book.

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3 Answers

 
Out of         100 minutes they study books for      78            minutes
 
out of             1  minutes they study books for   78/100        minutes
 
out of           50 minutes they study books for  (78*50)/100   minutes
 
                                                                      =39             minutes
     If 50 min are 100%
Then x   min are 78%
So we have a proportion: 50/x=100/78
Solve for x
x=78*50/100=3900/100=39 min