What has 13 hearts but no other organs?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Count the Triangle in the figure given below:

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Why did the Girl throw the butter out of the window?

John was drowned by he was not wet. How?

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.

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?