16
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This one is annoying me so much. Got this from a maths teacher.

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31
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D is equal to:

9

Explanation:

Each number written as a word has a roman numeral hidden inside. Nine has 'I', which is 1. Seven has 'V', which is 5. Five has 'IV', which is 4. Therefore, we look at Six and in it is hidden 'IX', which is 9.

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