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Assuming that there are 6 cubes in the bottom layer and 3 cubes on the upper layers, there are 9 cubes in total.

To form a 3 * 3 * 3 bigger cube, you need 27 unit cubes.

27 -9 = 18 unit cubes are needed.

(3) is the answer.

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Understood. So much clearer now. Thank you!

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(c) 18.

If the counting is a bit tough, you can imagine adding new layers to it. You can add 3 to form a 2 x 2 x 3 cuboid, then 6 more to form a 2 x 3 x 3 cuboid, then another 9 to form the final 3 x 3 x 3 cube. Then, the answer would be 3+ 6 + 9 = 18.

Hope this helps!

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