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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.

I need this question answerd as soon as possible please it would really help me alot

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Ruchi G. | Experienced Math tutorExperienced Math tutor
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78%of 50min=(78/100)*50=39min
 
Shafayat A. | Math Tutor. Algebra, Calculus Expert. Math Tutor. Algebra, Calculus Expert.
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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
Doina B. | I use Math to simplify life, not to complicate it...I use Math to simplify life, not to comp...
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     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