What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

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?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

What's the only room from which no one can enter or leave

Can you place three balls such that the equation shown in the picture holds true?

What begins with T, ends with T, and has T in it?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??