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This one needs a lot of lateral thinking

In the equation below replace all the question marks with one single word (same word at every question mark).

Then show that the equation is correct.

enter image description here

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    $\begingroup$ Frankly, NaN (not a number) busts this whole thing wiiiiide open $\endgroup$ – Avi Nov 4 '19 at 14:34
  • $\begingroup$ Is it an equation (condition) formulated in some programming language? $\endgroup$ – z100 Nov 4 '19 at 20:11
  • $\begingroup$ No @z100. Kind of straightforward $\endgroup$ – DrD Nov 4 '19 at 21:33
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Use ?=ROT to get:

ROT(ROT5(68))[ROT5(105)]=ROT(ROT5(68))[P]/ROT(ROT5(68))[Q]

which becomes:

ROT13[ROT5(105)]=ROT13[P]/ROT13[Q]

Now the clever bit, 105=CV in Roman numerals, and P->C, Q->D in ROT13:

ROT13(CV)=C/D

PI=Circumference/Diameter

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