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

Read also:

• Which current F1 drivers should switch teams based on historical patterns?
• Have you ever heard of the god Priapus being the same as the god Phosphorus?
• What are some things that children used to wait for, but are no longer common in today's society?
• Why am I so tired of the keto diet?
• Can men and women be friends?
• Has anyone been spanked by their parents after becoming an adult?
• What made you feel disgusted today?
• Is anyone up to have a little conversation?
• What's an uncomfortable truth you've learned to accept?
• Fallout Shelter has been downloaded over 230 million times in 10 years - Eurogamer
• There is any scientific evidence that we live in a sphere. Why do others say that we lives in a flat Earth but there is no evidence that they have proven the existence of a flat earth?
• Why do many men like women's breasts?
• What kind of pleasure do gay men get from being bottom? The idea is very appealing to me but in practice it's quite painful.