Can anyone tell me a word in the English dictionary which has a silent 'z'?

Before Mount Everest was discovered, what was the highest mountain in the world?

Replace the question mark with the correct number.

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

What part of Turkey has the most feathers?

Which number should replace the question mark?

10+10 and 11+11 can give you the same answer.

Explain how?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?