So guys, many people answered this question correctly. Initially I had said that I will chose just one person at random but since a lot of people answered this correctly, therefore I will be handing out the free access for 1 month to the 10 quizzes to 3 people. The 3 people whom i chose at random are:

Sohail Ali
Hira Rizwan
Muhammad Ali

Please check your emails to find the details of access. If you have any queries let me know.

Here is the question: The correct answer is x=105