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*From*: John Denker <jsd@av8n.com>*Date*: Sun, 29 Apr 2018 06:37:27 -0700

The following puzzle is somewhat amusing.

It went viral recently:

https://amp.businessinsider.com/images/5ae3808042e1cc5185248f88-750-563.jpg

It might be useful as a start-of-term pretest, to see

if students actually learned anything in HS math.

Note: The steeply sloping line meets the *midpoint* of

the top edge. I reckon the tick marks in the diagram

are supposed to indicate this, but it's a better puzzle

if solving it does not require knowing this obscure bit

of notation.

===============

Would anybody care to comment on the following criteria

for judging answers:

-- Some traction (as opposed to just giving up).

-- Numerical solution, but not correct.

-- Correct numerical solution.

-- Simple, elegant, insightful solution.

I would argue that the above leaves out three things,

all somewhat related. Hint/giveaway:

Fgneg ol bognvavat hccre naq ybjre obhaqf.

Purpx gur jbex hfvat obhaqf be bgurejvfr.

N erny zngurzngvpvna jbhyq sbezhyngr gura

fbyir gur trarenyvmrq ceboyrz, abg whfg

gur zvqcbvag pnfr.

Meta-hint: http://www.rot13.com/

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