Can you count the number of triangles in the picture below?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

I know a nine-letter word having only one vowel.
Do you ?

What type of tree can I carry in my hand?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

What does this Rebus Picture mean?

Name a key which is hardest to turn.

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?