What is the sum of X+XX+XXX+XXXX?

Read also:

• Two University of Wisconsin-Milwaukee researchers part of global team that discovered a new object in space - Milwaukee Journal Sentinel
• How are Hinduism and Sikhism related, considering they both originated in Punjab, India?
• Which is better, a naked picture of some one you know or porn videos?
• What caused the decline of the Soprano crew?
• What is world history that not many people know about?
• Why do people stay in cults after they have joined?
• How has your life changed for the past 10 years? Can you share your #10year challenge? Is your life better, worse, or still hopeful?
• Do you think trump realizes that if he significantly decreases the size of CIA, that there is a higher chance of him being assassinated?
• What is the definite integral of x^x from 0 to 2?
• Solar Orbiter gets world-first views of the Sun’s poles - European Space Agency
• Why do I sweat (mostly on face) when I eat usually spicy food?
• What are the best Jewish jokes?