What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

By what process could you make a 'Tea-Table' into food?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

How can you tell a raw egg from a hard-boiled egg?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?