Question

A drum full of rice weighs kg. If the empty drum weighs kg, find the weight of rice in the drum.

Answer 1

Weight of rice in the drum = Weight of the drum full of rice - Weight of the empty drum

$$\begin{gathered} =40\frac{1}{6}-13\frac{3}{4} \\ =\left(40+\frac{1}{6}\right)-\left(13+\frac{3}{4}\right) \\ =\frac{241}{6}-\frac{55}{4} \\ =\frac{241}{6}+\left(\mathrm{Additive}\mathrm{inverse}\mathrm{of}\frac{55}{4}\right) \\ =\frac{482-165}{12} \\ =\frac{317}{12} \\ =26\frac{5}{12}\text{kg} \end{gathered}$$
Therefore, the weight of rice in the drum is $26\frac{5}{12}\text{kg}$.