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

Read also:

• Can machine learning and AI make programmers obsolete? Can AI make software coding and debugging a thing of the past?
• Should any books be banned from school libraries? Why is it important for students to read certain books in school?
• Costco hours change for executive members Monday with new, early opening times - Axios
• 9 morning habits of people who age slower than everyone else, according to psychology - VegOut
• Why do wokes use words like "homophobes" when they don't know what that means? Do they realize that no one is afraid of them?
• Don’t be mad, Dana — Ilia Topuria is the face of the UFC, and that Paddy Pimblett fight is a blockbuster - Yahoo Sports
• Turning the Red Planet green? It's time to take terraforming Mars seriously, scientists say - Space
• Dejected Joshua Kimmich reacts to Germany’s Nations League defeat - Bavarian Football Works
• How do I remove frizz from hair?
• Will Labour's proposed ambitious targets for housebuilding in England be effective in solving the housing crisis?
• Column | We asked an oncologist: Should we worry about endocrine disruptors? - The Washington Post