###Human: 20 kids in preschool are ready for a nap.  1/2 of the kids fall asleep within the first 5 minutes.  Then half of the kids remaining fall asleep within another 5 minutes.  How many kids are still awake?, ### Assistant: In a class with 20 kids, 1/2 of the students have already fallen asleep so 20/2 = 10 kids are already asleep
We start with 20 kids awake and 10 are already asleep so 20- 10 = 10 kids are still awake
1/2 of these 10 kids fall asleep next meaning there are 10/2 = 5 students still awake 
 So the answer is :  5