Heidi's apartment has 3 times as many rooms as Danielle's apartment. Grant's apartment has 1/9 as many rooms as Heidi's apartment. If Grant's apartment has 2 rooms, how many rooms does Danielle's apartment have?
Heidi's apartment has 2*9=<<2*9=18>>18 rooms.
Danielle's apartment has 18/3=<<18/3=6>>6 rooms.
#### 6