81 x 9 = 801. What must you do to make the this equation true?

The Federal bank of London is abducted by the robbers. The head of the robbers asked the cashier to empty their money vault to them and when suddenly cashier got a call from her father. To avoid any suspicion, the robber asked the cashier to pick the call and reply her father in the shortest manner possible.

The cashier told her father "Is there an emergency father, Call me when you are free and I will help you in your furnishing" and then the cashier hung up the phone.

After 10 minutes, police arrived at the crime scene.

How did the police know about the robbery?

During which month do people sleep the least?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

What is the next number?

77, 49, 36, 18 ?