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-- Any odd number between 520 and 530 must start with "5 2",

so that's 7 out of the sum of 12 right there. How much is left ?

-- (12 - 7) = 5 . So the missing digit is 5 .

-- The number is 525 .

Check:

-- 525 is odd.

-- 525 is between 520 and 530.

-- (5 + 2 + 5) = 12 .

Yep. It works.

QED, man, QED !

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12y ago

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