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

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

Cristina learnt how to ride a horse recently. Just to test her skills, she rode the horse from her home to a mine which she covered in three minutes and returned home from the same path only this time she took four minutes. The reason was that while riding away from home, she was supported by the wind however while riding back, she was riding against the wind.

How fast do you think she could have ridden a mile if there was no wind?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Can you solve the maths in the below-given picture equation?

I am an odd number. Take away a letter and I become even. What number am I?

Why is a river so rich ?