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?

I cannot talk, but I always reply when spoken to. What am I?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

What kind of band never plays music?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

What is the longest word in the dictionary?

What does man love more than life, hate more than death or mortal strife; That which contented men desire; the poor have, the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?