Given $1 \frac{1}{8}+1 \frac{6}{7}+3 \frac{3}{5}$ $$\frac{9}{8}+\frac{13}{7}+\frac{18}{5}=x$$ By taking the LCM of 8, 7 and 5 is 280. $$\frac{315+520+1008}{280}=\frac{1843}{280}=6 \frac{163}{280}$$
Explanation as extracted from the printed page; notation may be imperfect.