Asha purchased 5 kg 400 g rice, 2 kg 20 g sugar and 10 kg 850 g flour. Find the total weight of his purchases.

Weight of rice = 5 kg 400 g

= 5 kg + $\dfrac{400}{1000}$ kg = 5 kg + 0.400 kg = 5.400 kg

Weight of sugar = 2 kg 20 g

= 2 kg + $\dfrac{20}{1000}$ kg = 2 kg + 0.020 kg = 2.020 kg

Weight of flour = 10 kg 850 g

= 10 kg + $\dfrac{850}{1000}$ kg = 10 kg + 0.850 kg = 10.850 kg

Total weight = 5.400 + 2.020 + 10.850

Writing in column form and adding:

$\begin{array}{r} \phantom{+}5.400 \ 2.020 \ +\space 10.850 \ \hline 18.270 \end{array}$

Hence, the total weight of Asha's purchases is 18.270 kg or 18 kg 270 g.