Rahul bought 4 kg 90 g apples, 2 kg 60 g grapes and 5 kg 300 g mangoes. Find the total weight of all the fruits he bought.

Weight of apples = 4 kg 90 g

= 4 kg + $\dfrac{90}{1000}$ kg = 4 kg + 0.090 kg = 4.090 kg

Weight of grapes = 2 kg 60 g

= 2 kg + $\dfrac{60}{1000}$ kg = 2 kg + 0.060 kg = 2.060 kg

Weight of mangoes = 5 kg 300 g

= 5 kg + $\dfrac{300}{1000}$ kg = 5 kg + 0.300 kg = 5.300 kg

Total weight = 4.090 + 2.060 + 5.300

Writing in column form and adding:

$\begin{array}{r} \phantom{+}4.090 \ 2.060 \ +\space 5.300 \ \hline 11.450 \end{array}$

Hence, the total weight of the fruits bought is 11.450 kg or 11 kg 450 g.