What four weights can be used to balance from 1 to 30 pounds?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

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?

Which number comes next in the number series?

2, 9, 30, 93, ?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

What has hands, but can’t clap?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

Why is the Hole below a Lock?