Which alphabet letter is a question?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Can you place six X (crosses) in below board without making three in a row in any way ?

Find the missing number in the sequence below:

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

What will you call your mother's brother's brother-in-law?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?