If the question reads "3.8 inches long", then the total length is 6*3.8=22.8"; if it reads "between 3 and 8 inches long", then, since we're not given how many pieces of each size there are, we can only work off averages. The minimum length would be 6*3=18" and the maximum would be 6*8=48". The average is (48+18)/2=33". Or, we can work out the average length of a single piece: (3+8)/2=5.5" and multiply by 6=33".