a) 4 × 3 × 3 = 36

Or

6 × 6 = 36

b) square face has all 4 sides same length.

Area of square = L × L
64cm² = 8cm × 8cm

So one side of the square is 8cm long.

Now the container can fit 3 small boxes across its breadth when the boxes are placed breadth wise(breadth of the boxes refers to the square side lengths)

Breadth of container = 8cm × 3 = 24cm

But the container can fit 2 small boxes across its breadth when the boxes are placed lengthwise wise(longest side of the boxes)

So 2 box lengths = 24cm
1 box length = 24cm ÷ 2 = 12cm

We can see that :

Length of container = 4 box lengths
= 4 × 12cm
= 48cm

Breadth of container = height of container
= 3 square lengths
= 24cm (already found earlier)

Volume of container

= Length × breadth × height

= 48cm × 24cm × 24cm

= 27 648 cm³