Find the smallest number by which the number 200 must be multiplied to obtain a perfect cube.

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• A 2
• B 5
• C 10
• D 100

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Answer: B. 5

Explanation: The prime factorisation of 200 gives:

200 = 2 × 2 × 2 × 5 × 5 = 2³ × 5 × 5

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