Dr Doolittle's daughter has lots of pets. Skippy, her pet kangaroo, is twice as tall as she is. Porky, her pet pig, is half as tall as she is. Sylvester, her pet cat, is half as tall as Porky.
If Sylvester is 30 cm tall, how tall is Skippy ?
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Primary Mathematics Challenge 2002 (2002)
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