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