You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Can you count the number of triangles in the given figure?

Three cars are driving on a track that forms a perfect circle and is wide enough that multiple cars can pass anytime. The car that is leading in the race right now is driving at 55 MPH and the car that is trailing at the last is going at 45 MPH. The car that is in the middle is somewhere between these two speeds.
Right now, you can assume that there is a distance of x miles between the leading car and the middle car and x miles between the middle car and the last car and also, x is not equal to 0 or 1.
The cars maintain their speed till the leading car catches up with the last car and then every car stops. In this scenario, do you think of any point when the distance between any two pairs will again be x miles i.e. the pairs will be x distance apart at the same time ?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Take one out and scratch my head, I am now black but once was red. What am I?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Prove that twice of ten is the same as twice of eleven.

what's the probability of getting a king or a queen from a pack of 52 cards?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?