What word begins and ends with an E, but has only one letter?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Spot 5 differences in two Christmas tree below:

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

I am working in a bus company. The company recently went under expansion and therefore there was not enough room for all the buses. As a result, twelve buses had to be stored outside.

If the company decides to expand the garage space by forty percent, enough space to accommodate the current buses will be created leaving enough space for twelve more buses if the need arises in future.

Can you calculate the number of buses that the company owns at present?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

Solve the puzzle by telling what does below picture means.