Find the number of squares in the below picture

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Count the Triangle in the figure given below:

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

The pound is not a finish.

We are sharing a few instructions below, which you have to use in any suitable order to modify the above sentence such that the end sentence is a scientific fact.

- Eliminate a letter and supplement another in its place.
- Take away one word.
- Remove one letter from one word.
- Get rid of two letters from one word.
- Swap a word with its antonym.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

How can you drop a raw egg from a height onto a concrete floor without cracking it?