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It is 38/2.
Half of 64/38 = 16/19.
If you are 38, you were born in 1972, provided that you were born during the first half of January. If you were born later in the year than the first half of Januray, then you would have had to be born in 1971 to be 38 today, on Janurary 15, 2010 (as I type).
If we're looking for half of 77, we'll find that 38 1/2is the answer.
1/2 metre is -37.5 metres longer than 38 metres.