Find the length of the bridge ?

There is a river which is 4100 inches wide, and the bridge across the
river is in such a way that one seventh of the overall length of the
bridge was on one side of the river and one eighth of the bridge was
on the other side of the river.
Find the total length of the bridge?

[Note: The bridge perfectly straight]

Chess board problem

what is maximum no. of kings which can be placed on a chessboard so
that no 2 of them put each other in check?
[provided all kings are of one color and check rule is applicable to
same color kings]

dumb & deaf

How can a deaf man without the help of anyone confirm that
he is not dumb?

15, 161, 1771, 19481, 214291,______?

Next number in the sequence
15, 161, 1771, 19481, 214291 is

Options:

1) 1942651
2) 135611101
3) 2424561
4) 1357101
5) 345372101
6) 1357201
7) 23651121
8) 1764924
9) 125461
10) 234255

A man wanted to get into his work building....

A man wanted to get into his work building, but he had forgotten
his code. However, he did remember five clues.
These are what those clues were:

# The fifth number plus the third number equals fourteen.
# The fourth number is one more than the second number.
# The first number is one less than twice the second number.
# The second number plus the third number equals ten.
# The sum of all five numbers is 30.

What were the five numbers and in what order?

Hourglass puzzles

You have two sand hourglasses, one that measures exactly 4 minutes
and one that measures exactly 7 minutes. You need to measure out
exactly 2 minutes to boil an egg. Using only these two hourglasses,
how can you measure out exactly 2 minutes to boil your egg?

Amazing Sentences

Write a meaningful sentence of 15 words in such a way that the first
word is of one letter long, second word of two letters, third word
is three letters long ............ 8th word is 8 letters long
and so on ... until the 15th word is 15 letters long !!!

(If you are successful with 15 words then try using 20 words)