Solution:

168
12 14
6 2 7
3 2 1 7

Explanation:
If we multiply two numbers below, we will get the number above it.
like. 3*2 of the last row =>6 of the third row.

Solution:

15/4 hours

Explanation:
Let us say they drive for "t" hours and initial fuel is "f"
Amount of fuel consumed by Fernando car is ft/4
Amount of fuel consumed by Sebastian car is ft/5

As per given condition,
f - ft/5 = 4(f-ft/4)
t = 15/4 hours

Solution:

    35997
+ 284508
========
    320505
========

Solution:

18 * 12 / 6 + 4

Solution:

0(zero) off course.

Solution:

20 more bullets

Explanation:
Initially, Willian has 'W' bullets and Pedro has 'P' bullets.

Based on statements, we have 2 equations
3P = W
2(P+10) = W-10

=> 2P + 20 = 3P - 10
=> 30 = P

P = 30 and W = 90.

Willian gave 10 bullets, therefore, need to give 20 more bullets so that they can 60 bullets each.

Solution:

7 years.

Explanation:
Kylian * Thorgan * Eden = 175
and only value that fits in above equation is:
Kylian = Thorgan = 5years
Eden = 7 years

Solution:

2

Solution:

3

Explanation:
The logic used to decipher the equation : Sum the numbers and then subtract the two digits to get the desired answer.

09 + 11+ 13 => 33 => 3 - 3 => 0
12 + 14 + 17 =>43 => 4 - 3 => 1
22 + 25 + 28 =>74 => 7 - 5 => 2
31 + 32 + 33 => 96 => 9 - 6 => 3

Solution:

100