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

Which country gets ill every time?

Can you find the key in the picture below?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

Rearrange the letters in "new door" to make one word.

What does this rebus riddle means ?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

What am I?