“This is a Non-sensa IQ Test Question,” said Grandpa giggling.

“It is not math but there may be some science behind it.


X is 527 and

I is 810 Then,

IX is?

A: 2810
B: 75310
C: 110
D: A or B


1 Answer 1


The answer Grandpa wants to hear is:

D: A or B


For a given Roman numeral, we need to:

1. Spell that number out in English,
2. Find elements in the Periodic Table whose symbols can be combined to spell the same word,
3. Give as our answer a number made up of those elements' atomic numbers concatenated together.

For example:

X is 10 (TEN) in Roman numerals.
TEN = Tellurium (Te) + Nitrogen (N).
The atomic numbers of these elements are 52 and 7.
Hence X=527

I is 1 (ONE) in Roman numerals.
ONE = Oxygen (O) + Neon (Ne).
The atomic numbers of these elements are 8 and 10.
Hence I=810

So for IX:

IX is 9 (NINE) in Roman numerals.
NINE = Nickel (Ni) + Neon (Ne).
The atomic numbers of these elements are 28 and 10.
Hence IX=2810

NINE = Nitrogen (N) + Iodine (I) + Neon (Ne).
The atomic numbers of these elements are 7, 53 and 10.
Hence IX=75310 as well!

Thus our answer is:

D - since IX is equivalent to both 2810 and 75310 using his method!

  • 6
    $\begingroup$ One of these days @Stiv Grandpa will have a question that will take you at least few hours to answer!! $\endgroup$
    – DrD
    Dec 21, 2020 at 13:53
  • 9
    $\begingroup$ One of these days @DrD you'll discover that I am Grandpa... (PLOT TWIST) $\endgroup$
    – Stiv
    Dec 21, 2020 at 13:58
  • 3
    $\begingroup$ Dang it. I should have known :) $\endgroup$
    – DrD
    Dec 21, 2020 at 13:59
  • $\begingroup$ A good lawyer might be able to argue that the answer is A, because there is no evidence to suggest a value can ever be made up of anything other than exactly 2 elements. (Just an observation, not trying to say you are wrong) $\endgroup$
    – musefan
    Dec 22, 2020 at 10:20

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