15 minutes
<h3>
Further explanation</h3>
<u>Given:</u>
- Jenny has an hour before its bedtime.
- Jenny spends
of an hour texting a friend and
of the remaining time brushing her teeth and putting on her pajamas. - She spends the rest of the time reading her book.
<u>Question:</u>
How long did Jenny read?
<u>The Process:</u>
Step-1: We need to calculate the time of texting a friend in minutes.
Recall that 


We crossed out 5 and 60, i.e., 

Therefore,

Step-2: Let us calculate the remaining time.

Step-3: Jenny spends
of the remaining time brushing her teeth and putting on her pajamas.

We crossed out 8 and 24, i.e., 


Step-4: Let us calculate how long Jenny read for the rest of time.

Thus, Jenny spent 15 minutes reading a book before its bedtime.
- - - - - - - - - -
Quick Steps:
Let us calculate how long Jenny read for the rest of time.





<h3>Learn more</h3>
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Keywords: Jenny, has an hour, before its bedtime, spends 3/5 of an hour, texting a friend, 3/8 of the remaining time, brushing her teeth, putting on her pajamas, reading her book