what does the below math rebus puzzle mean?

Look at the picture and find out which square is not linked with any of the other squares.

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Find the last number in the series below:

voN luJ yaM raM ---

What has one letter and starts with an E?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?