If two's company, and three's a crowd, then whats four and five ?

There is a bag which have 21 blue balls and 23 red balls. You also have 22 red balls outside the bag. Randomly remove two balls from the bag. * If they are of different colors, put the blue one back in the bag. * If they are the same colour, take them out and put a red ball back in the bag. Repeat this until only one ball remains in the bag. What is the color of the sole ball left in the bag ?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

Solve the equation in the image by looking at the pattern closely.

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

What is the centre of gravity?

Can you decipher the below rebus?

PBLUESAISNUERSES

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?