Food fractions

This task is about finding the fraction of a set.
 
Sam had lots of food at his birthday party.

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16 sandwiches
a)  There were 16 sandwiches and half of these were eaten.
     How many sandwiches were eaten? 

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12 donuts
b)  There were 12 donuts and a third had pink icing on them.
     How many donuts had pink icing? 

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4 soft drink bottles
c)  One of the 4 bottles of soft drink was drunk at Sam's party.
     What fraction of the soft drink bottles were drunk?  

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12 piece pumpkin pie
d)  Nine of the twelve pieces of pie were eaten.
     What fraction of the pie was eaten?  

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15 pieces of birthday cake
e)  Sam cut his birthday cake into 15 pieces.  After the party \(1 \over 5\) of the cake was left over.
     How many pieces of cake were left?