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

Read also:

• What is the story of how you met your spouse?
• Why is there so much hate against black people?
• How do I confess to my crush who had a traumatic past with his previous partner without losing the friendship?
• What is a good habit and what is bad one?
• Humans have evolved and become hairless and odor free. How do other races learn about evolution since evolution does not apply to them?
• How do I write a character’s physical description without it feeling unnatural and clunky? I’m able to describe their hair and body relatively easily because my writing puts emphasis on small movements and fidgeting, but I can’t describe faces.
• My stepmother has banned me from the family. Can she legally keep me from going to my father's funeral?
• Why won't Canada build their own fighter jet?
• © you're so funny!
• Why do liberals think it is okay to steal votes while the rest of us obey the law(s)?