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

Read also:

• Why do only ugly women like me on Tinder? Is it because I'm an ugly man?
• NASA raises the odds that an asteroid could hit the moon in 2032 - Space
• Olfactory neurons use unexpected 'solid' clusters to achieve genetic precision - Phys.org
• Are there any Indian wife swapping stories?
• How many Russians really understand the state they live in?
• NZ nutritional biochemist takes her supplement breakthrough to the market - Stuff
• Is it painful for men to wear bras, panties, and tampons?
• What are some tips for braiding a woman's hair on a date?
• What's the most trivial thing that ever made you go to the doctor?
• Beyond fertility and menopause: See why the ovary is central to women’s health and longevity - USA Today