-27⅓ + 64 1/6 + 121½

-27⅓ + 64 1/6 + 121½

$- 27 frac{1}{3} + 64 frac{1}{6} + 121 frac{1}{2} = \ - frac{82}{3} + frac{385}{6} + frac{243}{2} = \ - frac{164}{6} + frac{385}{6} + frac{729}{6} = \ frac{ - 164 + 385 + 729}{6} = frac{950}{6} = \ frac{950}{6} = 158 frac{1}{3}$