Tomas ate 1.5 * 16 = <<1.5*16=24>>24 ounces
Katya ate 0.5 * 16 = <<0.5*16=8>>8 ounces
Boris ate 2 * 16 = <<2*16=32>>32 ounces
Total = 24 + 8 + 32 = <<24+8+32=64>>64 ounces
The 3 friends ate 64 ounces of fudge in total.
#### 64