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21. If the surface area of a cube is 486 cm². Find its volume. Solution: A cube has 6 equal surfaces.

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22. Is 42592 a perfect cube? If not, then by which smallest number should 42592 be divided so that quotient is a perfect cube?

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23. Which of the following are perfect cube? (i) 8000 (ii) 9000

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24. The cube of an odd number is

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25. The cube of an even number is

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26. The cube of 8 is

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27. The cube root of 8 is

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28. The square of a number is 16. What is its cube?

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29. The square of a number is 64. What is its cube root?

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30. Which natural number is equal to its cube?

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