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

Read also:

• TIFF People’s Choice Award Winner ‘The Life Of Chuck’ Latest Indie To Test Box Office Revival With Neon Gifting Campaign – Specialty Preview - Deadline
• Why, after a divorce, would one still want to ruin the other one’s life?
• This ‘smoke’ ring was formed by one of the biggest creatures on Earth. Scientists say it has never been documented before - BBC Wildlife Magazine
• Can This Blue Chemical Really Boost Your Brain? Here's What We Know. - ScienceAlert
• The Hemi V-8 Is Back: ‘We Screwed Up,' Says Ram CEO - Motor1.com
• FX’s ‘Alien: Earth’ Official Trailer Reveals a Predatory Twist - The Hollywood Reporter
• Have your parents ever walked in on you?
• The "Tooth Hurty" Joke Has Its Origins In Ancient, Armored Fish - Defector
• Rare Red Sprites Captured Lighting up the Tibetan Night Sky Like Jellyfish-Shaped Firework - My Modern Met
• Nephrologist shares signs to know if your kidneys are not healthy: 'Weight loss and poor appetite to swelling in…' - Hindustan Times
• Do Marines really not need sleep during combat training or in general? If this is true, how and why is this possible?
• Why do creationists ask for proof of evolution and then ignore the answers?
• What's an uncomfortable truth you've learned to accept?
• Kristin Davis Set The Record Straight On Whether She Dated Chris Noth - BuzzFeed
• Why do people who were very kind and loving once become cold-hearted?