How can you tell a raw egg from a hard-boiled egg?

I cannot talk, but I always reply when spoken to. What am I?

Replace the question mark with the number below given a simple math problem.

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

81 x 9 = 801. What must you do to make the this equation true?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

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?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

Why are televisions attracted to people?

How many triangles are there in the picture below?