Hazel and Razel are twins who share everything they receive. If Hazel received 6 shirts, while Razel received twice the number of shirts as Hazel. How many shirts do they have in total?
Razel received 6 x 2 = <<6*2=12>>12 shirts.
Therefore, they have 12 + 6 = <<12+6=18>>18 shirts altogether.
#### 18