table: 1-10342194-3
columns: District, Total amount of trees, Prevailing types, %, Amount of old trees, Amount of trees, that require replacement
Q: What is the district when prevailing types, % is acer negundo — 30.22 tilia — 18.6 poplar — 15.23?
A: SELECT District FROM 1-10342194-3 WHERE Prevailing types, % = 'Acer negundo — 30.22 Tilia — 18.6 Poplar — 15.23'