Which is heavier: a ton of bricks or a ton of feathers?

What is the largest number you can write with just 3 digits?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

Take away the whole and some still remain. What is it?

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

How can a man go eight days without sleep?

You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

what does this picture(rebus) riddle means ?

A bomb exploded in a room full of married couples and no one died. How?

Given that

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

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)