What is the Surname of Barbie Doll?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Find the missing number in the sequence below:

Be active and find the killer in the picture Riddle below.

Which five letter word can be added at the end of below word to form a
valid word?

> Pin
> Check
> Boiling
> View

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

How can you make a TV, a bed, a dog, and a car liquid?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

It begins where the time ends.
Its second is an expression of surprise.
Its third is a question.
Its fourth is urinate.
It ends with a drink.

Which country it is?