Solution:

The bottom train.

The trick to solving maze problems quickly is to start drawing from the end(station in this case).

Solution:

8/(1−1/5)

Solution:

C7 => B8
Exchange pawn for a knight

Check-Mate

GameOver

Solution:

Move and then pour all juice from second glass to fifth glass.

Solution:

The wise man told them to switch the horses and then race. In this manner, both of them will be willing to race as fast as they can to prove that the other horse (his own horse) is slow.

Solution:

In the picture you can find the green matchsticks. We have moved them from the bottom and placed them in the middle. It was a bit tricky but now you have your desired result.

Solution:

At every floor, the detective had to open the window himself. If the man had committed suicide, then at least one of the windows must have been open. A person who is committing suicide won’t close the window behind him. Thus he knows that someone pushed him off the edge and closed the window afterwards.

Solution:

28 =>1+2+4+7+14

cannot be 1 (as number cannot be included)

Solution:

There are six unique answers

Ans1:
7 x 4 = 28
36 / 4 = 9
1 + 4 = 5

Ans2:
9 x 4 = 36
28 / 4 = 7
1 + 4 = 5

Ans3:
3 x 8 = 24
56 / 8 = 7
1 + 8 = 9

Ans4:
7 x 8 = 56
24 / 8 = 3
1 + 8 = 9

Ans5:
4 x 8 = 32
56 / 8 = 7
1 + 8 = 9

Ans6:
7 x 8 = 56
32 / 8 = 4
1 + 8 = 9

Solution:

The woman told him to take out one nut each from the rest of the wheels and use them.

Solution:

It can be done in 8 moves as shown in the animated image below.