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

Read also:

• Why do Christians think voting for Trump is any better than voting for Kamala Harris?
• Retinal prosthesis woven from tellurium nanowires partially restores vision in blind mice - Phys.org
• The Tech Industry Said It Was "Impossible" to Create AI Based Entirely on Ethically-Sourced Data, So These Scientists Proved Them Wrong in Spectacular Fashion - futurism.com
• How are you spending your best time?
• Fishing is a popular pastime on many US beaches. What is a type of saltwater fish commonly caught from piers or by wading (flounder, redfish, etc.)?
• WWE Money in the Bank results: Powell's review of John Cena and Logan Paul vs. Jey Uso and Cody Rhodes, two MITB ladder matches, Lyra Valkyria vs. Becky Lynch for the Women's Intercontinental Title - Pro Wrestling Dot Net
• Which album is your favorite that's now 50 years old (from 1975), and what's the best song on the album?
• What if you were the only and last person left on Earth. How will you survive and what would you do with your life?
• What's the most sordid activity you've ever seen or heard about at a bachelorette party?
• Why do untreated borderlines always blame their partners when they actually think they are normal?