Puzzle 56 - How many

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 Solution : There are 5 sheep and only one of them is ewe. 

Number of heads = 5   

Number of hooves = 20

Number of tongues of ewes = 1

Heads*hooves*tongues = 5*20*1 = 100


Bonus puzzle:

A simple puzzle: 

The world’s tallest skyscraper took seven years to build. Each year the workmen
were able to double its height. How many years did it take for the skyscraper to
reach half of its maximum height?

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