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

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

What has many teeth, but cannot bite?

What is the next number in this series?

4,12,84,3612....

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?