Kayla bought 12 chocolate bars / 2 = <<12/2=6>>6 chocolate bars.
She also bought 18 soda cans / 2 = <<18/2=9>>9 soda cans.
The total number of chocolate bars and soda cans Kayla bought is 6 chocolate bars + 9 soda cans = <<6+9=15>>15 items
#### 15