What is the fastest way to double your money?

Find the next number in the sequence

5 12 24 36 ?

You can see three almost identical images below. Can you spot the odd one out from them?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

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?

When it is alive we sing, when it is dead we clap our hands. What is it?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

What does this rebus riddle means ?

Can you count the number of triangles in the given figure?

Take away the whole and some still remain. What is it?