Rectify the following equality 101 - 102 = 1 by moving just one digit.

500 women soldiers are arranged in an array of ten rows and fifty columns in accordance with their respective heights. Now, the tallest woman from each row is asked to move out in the front. From them, the shortest one is labelled as Alpha. They are then asked to resume their original position.

Now, the shortest woman in each column is asked to come out in front. The tallest among them is labelled as Beta.

Can you find out if Alpha will be taller or Beta?

What is black when you buy it, red when you use it, and gray when you throw it away?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

What happened when the wheel was invented?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

What is next number in the pattern below:

131 517 192 123 ?

Count the number of triangles in the picture below: