Solution:

It can be done as shown in the picture below. You can also watch video For more explanation.

Solution:

$2000

Explanation:
Profit from 1st transaction = $1000 (23000-22000)
Profit from 2nd transaction = $1000 (24000-24000)

So the overall profit will be = $2000.

Solution:

Seven

Explanation:
5(dead) + 1(Alive) + 1(you)

Solution:

3

Explanation:
Note: Glass 5 6 and 7 not possible as there is a blocked connection.
Now, as the connection to 3 is lower than that of 2, it will fill first while rest beer glasses will remain empty.

Solution:

==== 65 ==== 35 ====
== 34 === 31 === 4 ==
= 10 == 24 == 7 == -3 =

Solution:

Phoebe broke the machine and Monica is telling the truth.

> Rachel says Monica did it
If this is true, then the last statement must be true as well.

> Monica says Rachel is lying

> Phoebe says she did not.
If this is true, then one of the first two statements must be true as well.

Solution:

Harry Potter

Explanation:
If Ron had stolen the car, he must be telling the truth, which cannot be the case since he claimed Hermione stole the car. So Ron is lying, which results Hermione did not steal the car.

Solution:

A

Explanation:
On Picture B and C, the boy is holding the man while in picture A the man is holding the boy.

Solution:

Yes

Explanation
-> White starts the game with the knight
-> black move the pawn in the position of the picture.
-> White brings the knight to the original position.

Solution:

3

Explanation:
Possible matches
Chelsea vs Tottenham
Chelsea vs ManCity
Chelsea vs Arsenal
Chelsea vs Liverpool
Tottenham vs ManCity
Tottenham vs Arsenal
Tottenham vs Liverpool
ManCity vs Arsenal
ManCity vs Liverpool
Arsenal vs Liverpool

Therefore there is a total of 10 matches. After every match, 2 points were distributed between two teams as:
Case1: One of team wins:
Winning team will get 2 points.

Case2: Match ends up in a draw
Both teams will share a point.

Therefore 10*2 = 20 points should be the sum of all team points.

6 + 5 + 4 + 2 + ? =20
? = 3