Solution:

To do this, he must be pushing the cork inside the bottle and then taking out the coin.

Solution:

36 meters.

100/v1 = 80/v2
100/v2 = 80/v3

20+(20/v2)*v3=20+16 = 36

Solution:

Align the toothpicks to form TEN. Use one toothpick for each of the lines.

Solution:

9

Explanation:
2 < 3 < 5
To find out the required number of candies, take one in place of the least number (i.e. take one mango candy) and then add all the greater numbers (i.e. three strawberry and five pineapple candies) to it.

Required number of balls = 1 + 3 + 5 = 9.

Solution:

On the back, since bullet train is accelerating, therefore,the person at the back will spend less time than one in front.

Solution:

The Lady sitting in the chair has the detector attached to the back of her blouse.

Solution:

Michelangelo juggles the diamonds across while crossing the bridge.

Solution:

The mules is moving in circular path and hence outside legs travels more distance than inner legs.

Solution:

   9567
+ 1085
======
 10652

Solution:

The brain teaser can be solved as shown in the image below.

Solution:

1 2 3 4 5 6 and 7 8 6

Since summation of numbers 1-9(1 2 3 4 5 6 7 8 9) is 45 , so its impossible to divide into two equal parts.
Since we cant flip over 6 to make it 9 but we can flip 9 to make it 6 and hence the solution