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?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What is the next number in the series?

15 29 56 108 208 ?

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

What do you get if you add 2 to 100 four times?

Can you solve the maths in the below-given picture equation?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.