Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

What goes up but never comes down?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

What is both possible and impossible at the same time?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?