What does this mathematical rebus means ?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

Which of the below owl is odd one out?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Can you identify the Oscar-winning movie from the rebus below?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

A game is being played where eight players can last for thirty-five minutes. Six substitutes alternate with each player in this game. Thus, all players are on the pitch for the same amount of time including the substitutes.

For how long is each player on the pitch?

10+10 and 11+11 can give you the same answer.

Explain how?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?