This isn't much of a brain teaser, if a dum-dum like me can get 40 without even trying very hard.
This made me think: do browsers assume square pixels? So that an N by N pixel image will appear square when displayed? Or is that the responsibility of the OS?
41 edit: I amend to 40. I was double counting 1 square
40 - starting with a 4x4 grid, that makes 16+9+4+1 = 30, and adding 8+2 for the inner ones
Can someone explain where is the 41th, if there is one?
Thats how I counted them too. Start off with cell in top left corner and count 4x4 (16). Then make a 2sq cell and see that you can fit 3 of these across by shifting one cell at a time to make 3x3 (9). Same with 3sq cells (4) and 4sq cells (1) as the total size. Adding the inner ones is straightforward from there.
40
Hope I'm not missing any.
I've got 40 too :-)
i see dead people
There are four lights.
I see 40
me too, are you crowd-sourcing an IQ test?
LOL! That's funny :)
It's just something cool I saw on Facebook, thought I'd post it.