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

Read also:

• Scientists Warn: Long Work Hours May Physically Alter Your Brain - SciTechDaily
• Illum autem fuga doloremque est quod delectus id.
• How Fast Are You Aging? Neuroscience Says These 3 Simple Tests Can Tell You - Inc.com
• 'Happy Days' star Henry Winkler took Marlee Matlin in after difficult relationship with William Hurt - AOL.com
• 'Cheers' star's cause of death released - KING5.com
• I am skinny, I have been doing 100 pushups a day for more than a month and am seeing very few results, everything is so unfair, I workout more than anyone I know and am still skinny, why cant I build muscle?
• 183-million-year-old fossil gives incredible new insights into plesiosaurs from well-preserved skin - Earth.com
• 3 keys to success every Citadel intern learns their first week on the job - Business Insider
• The biggest binoculars we've ever tested: Celestron SkyMaster 25x100 hands-on review - Live Science
• Why are some people afraid of monsters?
• Oilers-Panthers tale of the tape: Who has the edge in Cup Final rematch? - theScore.com