At the duck park, there are 25 mallard ducks and ten less than twice as many geese as ducks.  Then, a small flock of 4 ducks arrived at the park and joined the birds already there.  If five less than 15 geese leave the park, how many more geese than ducks remain at the park?
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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