What happened when the wheel was invented?

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

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Can you find out the total number of triangles in the given figure?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

What has to be broken before you can use it?

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?

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

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?