If 1+9+8=1, what is 2+8+9?

What number should come in place of the question mark below?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

What is so fragile that saying its name breaks it?

Can you count the number of blocks in the picture below?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

When can we add 2 to 11 and get 1 as the correct answer?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

What is the relationship between these matchstick pictures below?