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

Read also:

• NASA’s CODEX Captures Unique Views of Sun’s Outer Atmosphere - NASA Science (.gov)
• What should every American know before traveling to the UK?
• 'Housewives' Exec Assistant and Mom of 2 Dies 'Moments After Giving Birth' to Son - TODAY.com
• In your opinion, who is the most overrated singer/band/artist in modern music history and why?
• What habits do happy couples have?
• Would the word literate carry the same meaning with public (common wealth) in 1900 vs today 2020?
• Watch It! Livestream Of A Giant Underwater Volcano In the Pacific Northwest Set To Blow In 2025 - IFLScience
• Fed Chair hit with savage message on interest rates - TheStreet
• Jared Leto Accused of Sexual Misconduct by Multiple Women, Denies Allegations - People.com
• 'City-Killer' Asteroid Even More Likely to Hit The Moon in 2032 - ScienceAlert