Verified Answer :

Let find how many do not like hot chocolate.  

.2075 = 15 fourth graders don't like hot chocolate. 

Now lets see how many like hot chocolate 

75 -15 = 60 kids like hot chocolate. 

Another way to do this is  you know that 20% of kids don't like hot chocolate then that means 80% must like hot chocolate.  

So now you just have to do .875 and you get 60  

\(20\%\ do\ not\ like\ hot\ chocolate,\ therefore\\100\%-20\%=80\%\ like\ hot\ chocolate\\\\p\%=\frac{p}{100}\to80\%=\frac{80}{100}=\frac{8}{10}=\frac{4}{5}\\\\80\%\ of\ 75=\frac{4}{5}\cdot75=4\cdot15=\boxed{60}\leftarrow answer\)

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