A cube of side 9 cm made of iron is melted and recast into 8 small cubes. Find the side (in cm) of each small cube.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 4.5.
Volume of cube = side3
Volume of big cube = 9 × 9 × 9 = 729 cm3
Volume of 1 small cube = 729 / 8 cm3
Let side of small cube = a
a3 = 729 / 8
a = 9/2 = 4.5 cm