Eight of us go fourth, not back, to protect our king from an attack. What are we?

In the Mexico City area, there are two Houses H1 and H2. Both H1 and H2 have two children each.
In House H1, The boy plays for Mexico Youth academy and the other child plays baseball.
In House H2, The boy Plays soccer for his school in Mexico and they recently have a newborn.

Can you prove that the probability of House-H1 having a girl child is more than that of House-H2?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

People make me, save me, change me, raise me. What am I?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.