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

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

Next Number in the Series,

5, 16, 49, 104, ?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

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?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?