Can you start the fire using two pieces of wood?

What Time Should the last watch show in the below figure?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

What is next number in the pattern below:

131 517 192 123 ?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M