What is the Surname of Barbie Doll?

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

A Detective reviewed the information they had on the case so far.

A lady named 'Caterina' was found shot and they already had a list of suspects - Ankit, Tarun, Harish, Manoj and Manish.
The killer is a fan of challenges him by leaving notes ad various places.
* The first was found in a toilet room.
* The second was found in an art room.
* The third was in a restroom.
* the fourth in an underwater room.
* The fifth at the no-smoking room.

All of the notes read the same thing, 'The clues are where you find the notes.' Yet, nothing was found at any place the notes were.
Detective the genius, immediately solved the case.
Who was the killer?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

What country can make you shiver?

A Child was born in Lahore, Pakistan. Still, the child is not a Pakistani citizen. why?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

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

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?