What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

What is red and smells like blue paint?

No matter how little or how much you use me, you change me every month. What am I?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?