What always comes into a house through the keyhole?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Find the next number in the series.
1 10 24 43 67 ?

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 ?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

What does this simple rebus mean?

Can it be possible to build a house that has all its four walls facing towards the South?

A girl was standing near the window thinking something. All of a sudden she decides something and throws something out of the window. She dies very soon after throwing it. She was perfectly healthy and had no disease or allergy. No one killed her and she did not commit suicide.

Can you think of any possible explanation that is logical as well for what happened there?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

What is the last thing you take off before bed?