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Total runners = 72
Runners dropped in the first half= (1/3) of 72 =(1/3)*72= 24
Runners remaining for second half = 72 - 24 = 48
Runners dropped in the second half = (2/3) of 48= (2/3)*48= 32
Runners who finished the race = 48 - 32 = 16
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