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

Read also:

• Older Americans are happiest living in these 5 US states, study says — is yours one of them? - Yahoo
• The Aging Brain: 6 Things You Should Be Doing to Slow Cognitive Decline - CNET
• What is the best comeback you used on someone?
• Astronomers discover black hole ripping a star apart inside a galactic collision. 'It is a peculiar event' - Yahoo
• Americans Are Growing Less Interested in Buying Electric Vehicles, Study Says - Road & Track
• Crypto Firm Tron, Led By ‘Top Fan’ Of Trump, To Go Public Through Reverse Merger - Barron's
• Bold & Beautiful Just Put Deacon On Luna’s Hit List — But Next Week’s Return of [Spoiler] Will Change Everything! - Soaps.com
• Judge extends order suspending Trump’s block on Harvard’s incoming foreign students - CNN
• Gaza-bound aid boat with Greta Thunberg on board arrives in Israel after its seizure - PBS
• Gov. Abbott activates state emergency resources ahead of anticipated severe weather - Click2Houston
• American netizens are flocking to another Chinese App Xiaohongshu (Little Red Book). Will Xiaohongshu become the next Chinese social app banned in the US?
• Newspaper headlines: Britain 'battle ready' and 'new Maddie search' - BBC
• What is the true purpose of the Freemasons? Are they a malevolent group or an organization that performs charitable acts?
• Terraforming Mars: Scientists Reveal the 3-Step Plan to Breathe Life Into a Dead Planet - SciTechDaily