Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

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

Prove that the below maths equation is true.

8 + 8 = 91

I have no life, but I can die. What am I?

Can you find a five letter word that is left with only two letters if one is removed?

Why is a river so rich ?

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

Make a sentence consisting of three words that have the whole alphabet.

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?