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0 / 60 seg.
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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Clue
180 CENTIMETRES. HALF OF HIS HEIGHT IS 90 CENTIMETRES. THEREFORE HIS FULL HEIGHT HAS TO BE DOUBLE OF THAT
THE NAIL WOULD BE AT THE SAME HEIGHT AS TREES GROW FROM THE TOP
THE NAIL WOULD BE AT THE SAME HEIGHT SINCE TREES GROW AT THEIR TOPS
SIX YEARS. THE WORKMEN WERE ABLE TO DOUBLE ITS HEIGHT EVERY YEAR, SO IT SHOULD BE HALF OF ITS MAXIMUM HEIGHT ONE YEAR BEFORE COMPLETION
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