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

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Take one out and scratch my head, I am now black but once was red. What am I?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

It begins where the time ends.
Its second is an expression of surprise.
Its third is a question.
Its fourth is urinate.
It ends with a drink.

Which country it is?

what's the probability of getting a king or a queen from a pack of 52 cards?

How do you go from 98 to 720 using just one letter?

why number 8549176320 is one of a kind?