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These tricky problems seem perfectly straightforward. At first.
Four singers take part in a musical round of 4 equal lines, each finishing after singing the round through three times.
The second singer begins
when the first singer begins the second line,the third singer begins when
the first singer begins the third line,the fourth singer begins when the first
singer begins the fourth line.
Find the fraction of the total singing time that
all four are singing at the same time.
Decimal base? Of course...
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