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I tried to play chess with my mobile phone and got upset too

Don't know, nothing passes here....

From the funny pics thread: (Quote from denne) = 100% * [1 - (hl/h2)^3]. But I would do it the following way: Then I get: Any mistakes here??

Guess I must answer this one myself (Hidden Content)

No problem That picture was not only funny but also gave us some brain exercise - thank you for finding it Edit:Another creative solution Edit 2:And one more

According to my calculations,1) if the pyramid is rectangular (each ball leans on 4 balls from the layer below), then the k-th layer from top has N[k]=k^2 balls;2) if the pyramid is hexagonal (each ball leans on 3 balls from the layer below and the first 3 layers have 1, 3 and 7 balls), then the k-th layer from top has N[k]=N[k-2]+3*(k-1) balls at k=2,3,4.... and N[0]=0, N[1]=1;3) if the pyramid is triangular (each ball leans on 3 balls from the layer below, the first 3 layers have 1, 3 and 10 …

And if we want to go higher...

My roommate has outwitted me again He offered a more optimal pattern for triangular pyramid, where N[k]=k*(k+1)/2, and the first 4 layers have 1, 3, 6 and 10 balls.Here is the updated plot: Sorry for triple posting. This task was a real brain teaser and made us busy for some hours

Hello RingotwinI think the lower right corner of the 2nd picture is not incorrect solution - it is just another way to build a pyramid ("Triangular 1-3-6" in my plot above).But thanks for finding the official answer

Mushroom is an incorrect answer for anyone who played Morrowind (Hidden Content)But how about headroom?Headroom - Wikipedia, the free encyclopedia

Something like this I guess:

But the term "Lift" is hard to apply in open space.

x+x+x=302x+y=40x+2y+2z=60 x=10y=20z=5

Two pupils - a boy and a girl - have just taken meteorological measurements.Now they are having a rest on a hill and looking at a cargo train passing by.The steam locomotive is puffing and smoking desperately heading uphill. A steady wind, without blasts, is blowing along the railway. "What wind speed have our measurements shown?" - the boy asked."7 meters per second"."Today this is enough for me to determine at which speed the train goes.""Is that so?" said the girl in doubt."Just look careful…

Correct! Trains were slow at that time A boy has as many sisters as brothers; his sister has two times fewer sisters than brothers.So how many sisters and brothers are there in the family?

(Quote from denne)In this case the boys' sister would be the only girl in the family, and thus have no sisters, which is not right. Try again (Two times fewer means "0.5x", not "x-2".)

Correct In Russian one can say it without any ambiguity, seems I just don't know the right words in English Okay, here is another one: This man needs to ferry a wolf, a goat and a cabbage head in a boat across the river. The boat can only take a man and either a wolf, or a goat, or a cabbage head with him. If the wolf and the goat are left alone on one bank, the wolf will eat the goat; if the goat and cabbage head are left alone, the goat will eat the cabbage. But in man's presence nobody eats …

Correct!There are also other ways, e.g. this one: (Hidden Content)Next: Wandering around the world, I have been to such places where the difference of temperatures between night and day was so great that my watch changed its clock speed when I spent days and nights on open air. I noticed that temperature change during day caused the watch to become ½ minutes fast, and during nights the watch became ⅓ minutes slow. In the morning of October 1st the watch was still showing the correct time. By wh…

I guess the above task required too many calculations and was more of a time killer than a brainteaser... I already forgot the answer anyway... Here is a quick one: Five apples lie inside a bin. How can one share these apples between five girls, so that each girl gets an apple, and one apple remains in the bin?

The official solution is "give one girl an apple together with the bin". You've got close enough (Quote from ringotwin)Many options here, e.g. 1) they want to be healthy and prefer walking instead of driving, 2) they are afraid that patients falling out of windows can damage their cars, 3) hospitals are far from petrol stations, 4) cars can never park in the same spot (it has to be different for every car!). Is any of these correct?...