Can you calculate the probability of getting a sum of six when a dice is thrown twice?

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?

Count the squares in the matchstick puzzle below?

A Monkey, a squirrel, and an Eagle are racing to the top of the mango tree. Assuming all these animals are in perfect shape, Which animal will reach to Banana first?

What has many keys but can’t open a single lock?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Find the smallest sentence with all the English alphabet.

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?