An article is of size 9cm×6cm×3cm. The number of such articles that can be packed in a box measuring 63cm×42cm×21cm is:

To find the number of articles that can be packed in the box, we divide the total volume of the box by the volume of a single article.
Volume of the box=63×42×21cm
3

Volume of an article=9×6×3cm
3

Number of articles=
9×6×3
63×42×21
​

We can simplify this by dividing individual dimensions:

9
63
​
=7
6
42
​
=7
3
21
​
=7
Number of articles=7×7×7=7
3
=343