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

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

What Time Should the last watch show in the below figure?

What is the next number in the series?

15 29 56 108 208 ?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

Look at the picture and find out which square is not linked with any of the other squares.

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

If,

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

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

D + F = ?