Why do you find that most of the buildings are deprived of the 13th floor?

Be active and find the killer in the picture Riddle below.

Which is faster, Heat or Cold ? Explain.

What does this mean?

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A Shopkeeper collects 71 rupees in the form of 20 paisa and 25 paisa.
He collects a total of 324 coins.

Can you tell me how many number of 20-paisa and 25-paisa he got?

By using 'because' continuously three times, can you make an English statement ?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

Can you find the missing piece of the Porsche?

81 x 9 = 801. What must you do to make the this equation true?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?