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

Read also:

• Al Pacino Meets Pope Leo XIV, Becoming First Movie Star to Get an Audience With American Pontiff - The Hollywood Reporter
• If you could go back and rewrite the Legend of Korra, what would you change, and why?
• When the mind leaves the body - scientists investigate the incredible phenomenon of OBEs - Earth.com
• Halo: Edge of Dawn | Cover Reveal | Halo - Official Site (en) - Halo Waypoint
• What were my 10 favorite great rock albums that were either forgotten or hardly known by the rock community at large during 1965-‘75?
• Falcons have been spotted at UC Berkeley. Is there hope for Campanile chicks again? - Berkeleyside
• 'Endling' is a shape-shifting debut that takes on heavy themes with humor - NPR
• How should I go about convincing my mother that my foreign online boyfriend isn't out to get my holes or scam me?
• What is better? Tik Tok or YouTube?
• Common Antibiotic Found To Tame Blood Pressure in Surprising New Role - SciTechDaily
• Why do so many 18 to 29-year-old men struggle in dating?
• All international travelers should get measles vaccine, CDC says - OregonLive.com
• Alex Cora Takes Blame for Red Sox Woes After Extra Innings Loss - Sports Illustrated
• Do British people say 'biscuits' when they mean cookies and 'jelly' when they mean jam, instead of saying the American words for them (cookies, jelly)? If so, why?