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

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

Find out the missing number in the picture attached:

Why is a river so rich ?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

Which is the rope you never skip with?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Find the missing number in the image below.

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?