PLANTED 12 birches, 6 lindens, and are less than oaks-twice, than birches and stuck together. How many oaks put?

104
1) 12+6=18 () - lindens and birches together 2)18:2=9 () - Answer's oaks: planted 9 oaks.1) 12+6 = 18 put trees only 2) 18:2 = 8 oaks put
86
Answer add