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?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Mother's Name is Mrs. SIXTY TWO
Son's Name is FIFTY TWO
Daughter's Name is FORTY TWO
What is Name of Father?

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

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

What is harder to catch the faster you run?

Which wheel of car does not rotate when you turn your car right?