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 = ?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Why is the Hole below a Lock?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

A car is crossing a 20 km-long bridge. The bridge can support at most 1500kg of weight over it. If somehow, the weight on the bridge becomes more than that, it will break.

Now, the weight of the car is exactly 1500kg. At the midway, a bird comes and sits on the roof of the car. This bird weighs exactly 200 grams.
Can you tell if the bridge breaks at this point or not?

Who is that with a neck and no head, two arms and no hands? What is it?

In the image below, can you find the value of an angle(y)

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

O_er_t_o_

Complete the missing letters of the given word.