With 9,000 extra entries in next year’s Boston Marathon, why are only 500 more going to qualifiers? The Boston Athletic Association got to 500 this way:

Take last year’s 27,000 entries and add 9,000 runners to make 36,000.

Take 4,500 off the top to accommodate the runners who couldn’t finish in 2013, leaving 31,500.

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Split that number: 70 percent (about 22,000) to qualifiers, 30 percent to charities, runners with 10 or more consecutive finishes, cities and towns, sponsors, and various other obligations.

Last year, the spilt was 80/20, so 21,500 entries (only 500 fewer) were allocated to qualifiers.