## Elementary Technical Mathematics

$33\text{ ft}$
Each duct is $3\frac{2}{3}$ ft long. To find the total length of 9 pieces, multiply 9 and the length of each duct to obtain: $=9 \times 3\frac{2}{3} \\=9 \times \frac{3(3)+2}{3} \\=9 \times \frac{11}{3} \\=\frac{9(11)}{3} \\=\frac{99}{3} \\=33\text{ ft}$