The figure is not drawn to scale. It shows the net of a solid. It is made up of 4 identical rectangles and 2 identical squares. Line H is 38 cm long and Line J is 24 cm long.
- Find the volume of the solid.
- This solid is a cardboard carton containing small boxes of mochi balls. Each box of mochi balls is 4 cm by 2 cm by 1 cm. If all these small boxes of mochi balls in the carton occupy more than 70% of the carton's volume, what is the minimum number of small boxes of mochi balls in the carton?
(a)
Breadth of the cuboid
= 24 ÷ 3
= 8 cm
Breadth of two squares
= Breadth x 2
= 8 x 2
= 16 cm
Length of the cuboid
= (38 - 16) ÷ 2
= 11 cm
Volume of the cuboid
= 11 x 8 x 8
= 704 cm
3 (b)
Volume of one box of mochi balls
= 4 x 2 x 1
= 8 cm
3 Volume of space occupied
= 704 x 70%
= 492.8 cm
3 Estimated number of small boxes
= 492.8 ÷ 8
≈ 61.6
Minimum number of small boxes to occupy more than 70% of the carton
= 61 + 1
= 62
Answer(s): (a) 704 cm
3; (b) 62