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

Read also:

• How scientists confirmed the existence of 200-million-year-old species thought to be extinct - ABC News
• Overthinking is killing me day-by-day. What should I do?
• Jenna Bush Hager Gets a Major Leslie Bibb-Inspired Hair Transformation on Live Television - instyle.com
• New COVID variant is spreading. Don’t underestimate it, experts say. - NJ.com
• Aphantasia: Why Some Minds Are Blind to Images - Neuroscience News
• Texas woman dies from brain-eating amoeba after clearing sinuses with tap water - Dallas News
• Shock as Republican plan will raise Americans' utility bills by hundreds a year - Alternet
• What is your opinion on Ukraine's reaction to Donald Trump saying they should have never started the war?
• Tesla’s Retail Army Defies Musk-Trump Spat to Place Record ETF Bet - Bloomberg.com
• There’s a place where humans are evolving right before our eyes - Boy Genius Report
• What are some things that children used to wait for, but are no longer common in today's society?
• What are hygiene habits that everyone should have?