What is both possible and impossible at the same time?

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

Find the smallest sentence with all the English alphabet.

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

If a wheel has 54 spokes, how many spaces are there between the spokes?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Move four matchsticks to the below square to form three squares?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?