The quantity in each box is given as 6kg and there were 221 boxes in total.
That means the total weight in kilograms would be;
[tex]\begin{gathered} \text{Per box=6kg} \\ \text{For 221 boxes=6kg x 221} \\ \text{For 221 boxes=1326kg} \\ \text{If 97 boxes had been sold, the amount of kilograms sold is} \\ \text{Sold}=97\times6\operatorname{kg} \\ \text{Sold}=582\operatorname{kg} \\ \text{Leftovers}=\text{Total}-\text{sold} \\ \text{Leftovers}=1326-582 \\ \text{Leftovers}=744\operatorname{kg} \\ \text{This means there are 744 kilograms left to be sold} \end{gathered}[/tex]Method 2:
[tex]\begin{gathered} \text{Total number of boxes=221} \\ \text{Number of boxes sold=97} \\ \text{Leftovers}=221-97 \\ \text{Leftovers}=124\text{ boxes} \\ \text{If each box contains 6 kilograms, then} \\ 124\text{ boxes=124 x 6}kg \\ 124\text{ boxes=744 kg} \\ \text{This result also shows that there are 744 kilograms left to be sold} \end{gathered}[/tex]