Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

What number divided by 4 is the same as that number minus 4?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

What do you get if you add 2 to 100 four times?

If 1+9+8=1, what is 2+8+9?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?