Cristina was born in 1888. She just had her 30th birthday today how did that happen?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

What number when divided in half becomes zero?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

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

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What two things can you never eat for breakfast?

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.

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

How many Watermelons are there in the below picture?