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

Read also:

• What is the difference between heaven and heavens?
• Why have feminists not demanded that females be required to register with the selective service? Are female lives more precious than male lives?
• Do you need goggles for red light therapy?
• What are the best mattress options for a comfortable night's sleep in Pompano Beach?
• Why is there so much evil in the world?
• Brain’s Reward Center Tracks Not Just What, But When Rewards Arrive - Neuroscience News
• This brilliant, hidden iPhone feature lets you print anything to PDF - Boy Genius Report
• 5 Drinks to Help You Debloat, According to Dietitians - EatingWell
• Researchers claim spoof-proof random number generator breakthrough - theregister.com
• Blocking Opioid Receptors May Restore Healthy Dopamine Balance - Neuroscience News
• NASA raises the odds that an asteroid could hit the moon in 2032 - Space