BrainDen.com - Brain Teasers

# TimeSpaceLightForce

Members

852

25

1. ## Lacking Last Letter

A basic DNA code-like sequencing below has a lacking last letter : What is it? C T T T C G A --------------------------- A A G C G G T T --------------------------- G T A C T T A C --------------------------- G C T G A G C G -------------------------- C A C A C A A _ --------------------------

3. ## Stopping and Turning back hands of time

This is the answer: Good one Prime! Thanks.
4. ## Stopping and Turning back hands of time

I see, I mixed up the adavance of the hour hand with the elapsed time for each cycle. And I calculated period incorrectly for the second part in my previous post. Still, after the corrections, I get a different answer. My hour and minute hands will meet a lot sooner. Why rejecting the occurences where the clock hands meet at 12 in a mid-cycle? I see nothing in the OP prohibiting that. In fact, the clock hands will meet again at 12 on a mid-cycle before they do so after a whole number of cycles.

10. ## Stopping and Turning back hands of time

@captainEd, the pic is not the start, both @ 12 o'clock is the start where the hands are moving clockwise, eventually the MH overtakes the HH causing it to stop but the MH keeps going until it reached the stopped HH again where then it reverses its direction (like bumping) while causing the HH to move again(resume running clockwise) . No double interpretations is intended here.
11. ## Stopping and Turning back hands of time

A peculiar Grandfather's clock has both its hour and minute hands running in proper rates. Starting at 12 o'clock both runs clockwise. But the hour hand stops when the minute hand passes over it. And the minute hand turn its direction back when it is over the stopped hour hand causing the hour hand to run clockwise again. How long will it take for both hands to be on 12 o'clock again?

13. ## Coins to Diamonds

Hai! That is yes..5 coins w/ 2 double diamater. Looks like a parallelogram with line in the middle. OP should say "same coin" but i guess no one use 4 half-cut coins (or bitable coins) to make 8 diameters. My angles were more...90 degrees . Sorry if I'm going on a completely different tangent than what the OP intended, to be honest, I'm not sure what the OP intends , but seeing your response to witzar made me think 'outside the box' (or plane of the box ) type solutions were acceptable. Oui! congrats Y-san .. merci

15. ## Coins to Diamonds

Hai! That is yes..5 coins w/ 2 double diamater. Looks like a parallelogram with line in the middle. OP should say "same coin" but i guess no one use 4 half-cut coins (or bitable coins) to make 8 diameters.

19. ## 1 to 8 Can wait!

edit: Note: back1 cube2,back2 cube1,back8cube7,back7cube8,back3cube4,back4cube3,back5cube6,back6cube5

21. ## Calculator!

i see it is like writing ..so 9 should start with O. Thanks wolfgang
22. ## Calculator!

Nice puzzle, left & right using 13 each (complete alphabet) . How you say 3 ,4 & 8?

25. ## Coins to Diamonds

What is the required minimum number of coins to produce two diamonds (regular rhombus) ?
×

• #### Activity

• Riddles
×
• Create New...