riddle 8 and 10...solved by dans 68...riddle 9 and 10...solved by defiance...

[captnsim]

 A man wakes up and sees that his brother is dead. Though they are alone in a quiet room, he immediately realizes that he will be dead soon too. How does he know this?

[resq302]

he drank the same poison.

[captnsim]

Nope but good guess!!

[Dans 68]

His brother is his conjoined twin (i.e., siamese twin).

Dan

[captnsim]

Correct

[captnsim]

16,17,23,24,39,40

Adding together each of these numbers as many times as you want, how do you reach a sum of exactly 100?

[defiance]

16,17,16,17,17,17

[captnsim]

Correct great job!!!   Riddle 10

You are locked in a jail cell with no windows. and you need to tap out a message on the wall for the man in the other cell next to you. The problem is that you have to do it at exactly 9:15 PM, when the guard outside is switched, so your noise won't be noticed. You can't hear the switching of the guards through your walls, and you have no clock.

There is a faucet with water dripping very consistently from it in the corner, but you don't know if it is dripping at 30 or 40 or however many drops per minute, and that wouldn't give you the time in any case. You can just make out the chiming of a church bell, but it chimes just once at the top of each hour, so you can't tell the time from that. You can feel the wall facing west start to cool after the sun sets, but you don't know what time the sun is setting, and this isn't very precise in any case. Your dinner is always passed into your cell between 6:15 and 6:45. How do you determine when it is exactly 9:15 PM?

[defiance]

You could count the drops between church bell rings to work out the rate.  Sure, that's time consuming, but do you really have anything better to do, convict?

[captnsim]

That's basically it...can you lay out the full solution for everyone else?

[Dans 68]

Knowing how many drips per hour (between chimes of the Church bell), divide that number by 4 to get 15 minutes. After dinner is served the 3rd Church bell would be 9:00 pm. After the bell count the drips to get that needed 15 minutes and tap out your message!

Dan

[captnsim]

  That sums it up...