# A simple debut puzzle [closed]

It's my first time here, so I'm just chumping out a random puzzle I found interesting. It is the following:

1 + 7 = 6

2 + 6 = 4

3 + 10 = 6

5 + 2 = ?

It's probably super easy for you geniuses because I've been the level of ability here, but I just wanted to have throw something out there.

• Ugh, I hate when people abuse the + and = signs.
– Deusovi
Commented Mar 20, 2016 at 15:34
• Does + mean something else here? Commented Mar 20, 2016 at 16:21
• Hello! Thanks for posting your question! Unfortunately, I'm not sure it's a good fit for this site. We prefer puzzles that have one demonstrably correct answer, especially for mathematical puzzles. But as discussed in this thread, puzzles where you're given a mystery function and have to guess one of the numbers can arguably have a large number of valid answers. This isn't to say that your puzzle is bad, just that it isn't the best fit for this particular site. Commented Mar 20, 2016 at 18:21
• Oh. I'll try to give a better puzzle next time, thanks for the heads up! Commented Mar 20, 2016 at 22:50

One possibility is

5

Because

You're spelling out the numbers, adding the number of letters, and subtracting 2.

ONESEVEN is 8 letters; 8-2=6
TWOSIX is 6 letters; 6-2=4
THREETEN is 8 letters; 8-2=6
FIVETWO is 7 letters; 7-2=5

My guess is

7

Because

You're summing the number of vertices in each number:

[]

(However, as that isn't necessarily very mathematical, I don't necessarily think this is the right answer.

• This seems a viable answer, as any, to me. Commented Mar 20, 2016 at 17:49
• If this answer is correct, the puzzle is rather disappointing, because this is not an equivalence relation (not symmetric). 6 only has one vertex. Commented Mar 20, 2016 at 22:12
• It's not the answer, but I must admit it's pretty genius. Commented Mar 20, 2016 at 22:49

My guess is …

5

Because …

Counting the letters in the english language words for each number and subtracting two gives:
one + seven = 8 letters; 8 - 2 = 6
two + six = 6 letters; 6 - 2 = 4
three + ten = 8 letters; 8 - 2 = 6
five + two = 7 letters; 7 - 2 = 5

• Rats. @BenM ninja'd me :) Commented Mar 21, 2016 at 0:31

5, because you might be adding the number of syllables in each line? = can be "equals" or "is"?

• But the first and third lines have different numbers of syllables yet are both 6.
– BenM
Commented Mar 21, 2016 at 0:23
• one plus sev en e quals = 6 syllables three plus one zer o is = 6 syllables Commented Mar 21, 2016 at 0:25