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?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

I left my campsite and hiked south for 3 miles. Then I turned east and hiked for 3 miles. I then turned north and hiked for 3 miles, at which time I came upon a bear inside my tent eating my food! What colour was the bear?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

How is a fly different from a mosquito?