Solution:

He should shoot at the ground.

If Kangwa shoots the ground, it is Rafael's turn. Rafael would rather shoot at Ferdinand than Kangwa, because he is better.
If Rafael kills Ferdinand, it is just Kangwa and Rafael left, giving Kangwa a fair chance of winning.
If Rafael does not kill Ferdinand, it is Ferdinand's turn. He would rather shoot at Rafael and will definitely kill him. Even though it is now Kangwa against Ferdinand, Kangwa has a better chance of winning than before.

Solution:

7, 4, 6, 5, 8

Solution:

No

Explanation:
7 is the only prime followed by a cube.
Assume that n3-1 is a prime for some n.
N3-1 will be equal to (n−1)(n2+n+1)
Now, n-1 divides n3-1.
If n-1>1, then we will have a contradiction to n3-1 being a prime.

Solution:

The next one is 8
77 : 7*7 = 49
49 : 4*9 = 36
36 : 3*6 = 18
18 : 1*8 = 8

Solution:

At that moment, the time, and day could be written as '12:34 5/6/78'

Solution:

He was walking

Solution:

He reported (truly) that the 'Alonso' came in next to last while the 'Hamilton' came in second.

Solution:

2-3
3-4
7-8
9-10

Solution:

Go.

Solution:

The women is a of short stature. She can't reach the upper elevator buttons, but can push is with his umbrella.