Area of 3 fields

This task is about working out area and perimeter.
Tim has some animals that he keeps in three different sized fields.
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Field Y is a square with an area of 100 m2.

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a)  The area of Field X is half the area of Field Y. 
     What is the area of Field X?   m2

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b)  The area of Field Z is two times the area of Field Y.
      What is the total area of the three fields?      m2

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c)  Tim decides to put a new fence around Field Y.
     To help Tim work out how much fencing he needs, work out the perimeter of Field Y.
     The perimeter of Field Y is m