Can you count the number of quadrilaterals in the picture below?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Prove that the below maths equation is true.

8 + 8 = 91

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

Move three sticks of the spiral below to form a square.

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

I can be made.
I can be cracked.
I can be told.
I can be played.

Who am I?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

Find the next number in the series.
1 10 24 43 67 ?