Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

They are three errirs in this question. Can you find them?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?