Initially, twice as many geese as ducks is 25*2=<<25*2=50>>50 geese.
Therefore, ten less than twice as many geese as ducks is 50-10=<<50-10=40>>40 geese.
Then, 4 ducks arrived at the park, resulting in 25+4=<<4+25=29>>29 ducks.
Five less than 15 geese is 15-5=<<15-5=10>>10 geese.
Thus, if 5 less than 15 geese leave, then 40-10=30 geese remain.
Thus, there are 30-29=<<30-29=1>>1 more geese than ducks remaining at the park.
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