Questions

Hence, the missing number iss 25.

France became the first country in the world to use drones for national mail service.

The main constituent of biogas is methane (55-70%), CO2 (30-45%) and some traces of gases such as H2S and ammonia.

Biogas is produced under anaerobic conditions; the process is denominated as anaerobic digestion.

When you work at a call center you will come across irritated, angry, and abusive customers, you can say you will do that following to handle them:

-  Listen to them and empathize with their situation

-  Apologize and take ownership of the problem and give a solution

-  Approach them and ask for a reason for their displeasure

-  If they insist on talking to your manager, get him on line ASAP

- Follow up after giving the solution and ask for feedback

Here the puzzle follows the logic that

Right side number = sum of the number on the left side and the previous number on the left side

=> 6 = 4+2

=> 10 = 6+4

=> ? = 16+10 = 26.