What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Different lights make me strange by changing me into different sizes. What am I?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

I have feet, but no legs. Which animal Am I?

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?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?