I was on my computer last night and I happened to be thinking of something very useful to me that I will call X. I was hungry so I added 15 to it like this:

$15 + X$

That did the trick. Later on, I wanted to go for a walk. I added 14 to it:

$X + 14$

And enjoyed my walk very much. It made me think of my childhood home. There were gooseberry, raspberry, and red currant bushes in the backyard. My backyard is too small for that. Obviously, the solution was:

$X + 13$

When I arrived back home, those memories made me feel lonely. Once again, X to the rescue:

$12 + X$

It had been an eventful evening. I had trouble sleeping. Instead of counting sheep, I decided to try a more complicated sum. I tried adding:

$11 + X + 13$

But I fell asleep before I got the answer.

I had the strangest dream. I dreamt that

$10 + X$

is male but

$X + 10$

is female. When I woke up, it I found it was true.

What is X?

  • $\begingroup$ is X a real number? $\endgroup$
    – ABcDexter
    Apr 13, 2016 at 9:18
  • $\begingroup$ @ABcDexter X is not a real number. $\endgroup$ Apr 13, 2016 at 9:35
  • 3
    $\begingroup$ I am tempted to say that 11 to 15 represent the letters from K to O, but I cannot find a word that could be combined with all of those. $\endgroup$
    – fffred
    Apr 13, 2016 at 10:26
  • 2
    $\begingroup$ @fffred I was trying the same with B to F, since the numbers might be a hexadecimal representation, but I haven't been able to find anything either... $\endgroup$
    – Wu33o
    Apr 13, 2016 at 10:29
  • $\begingroup$ @fffred Same here. + doesn't seem to be commutative, so it might be a concatenation, and X might be a string of characters. $\endgroup$
    – Bolo
    Apr 13, 2016 at 10:48

1 Answer 1


X may be:


I needed Wu33o hint for this

11 = B, 12 = C, 13 = D, 14 = E, 15 = F

Giving the words:

Flan as hungry
Lane for walk
Land for larger backyard
Clan for family/friends to overcome loneliness
Bland so will not be excited and will sleep.

  • $\begingroup$ Caught me just as I was adding a hint. Well done! $\endgroup$ Apr 13, 2016 at 11:06
  • $\begingroup$ Nooooo, I was so close! Good job :) $\endgroup$
    – Wu33o
    Apr 13, 2016 at 11:15
  • 1
    $\begingroup$ Addendum answers: Alan is a male name, Lana is a female name $\endgroup$ Apr 13, 2016 at 15:01
  • $\begingroup$ You missed just the male/female hint, which is easy: just make 10 = A (for completeness, it is hexadecimal representation). $\endgroup$
    – Chaotic
    Apr 13, 2016 at 15:02

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