I have feet, but no legs. Which animal Am I?

What has 13 hearts but no other organs?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

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?

Can you find out the missing number in the grid?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

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 ?

What is the next number in this series?

4,12,84,3612....

You have $100 with you and you have to buy 100 balls with it. 100 is the exact figure and you can't go below or above the numbers and you have to use the entire $100. If there is no kind of tax applied how many of each of the following balls will you be able to buy:

Green Balls costing $6
Yellow Balls costing $3
Black Balls costing $0.10

Now, how many of each must you buy to fulfil the condition given?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?