For buying 4 jackets Martha gets 4 jackets / 2 = <<4/2=2>>2 jackets for free
For buying 9 t-shirts, Martha gets 9 t-shirts/ 3 = <<9/3=3>>3 t-shirts for free
Adding the free jackets, Martha gets 4 jackets + 2 jackets = <<4+2=6>>6 jackets
Adding the free t-shirts, Martha gets 9 t-shirts + 3 t-shirts = <<9+3=12>>12 t-shirts.
In total, Martha will take home 6 jackets + 12 t-shirts = <<6+12=18>>18 clothes
#### 18