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

Read also:

• Can you recommend a simple song with an awesome solo? What makes the solo stand out?
• Can you write a poem or short story based on the first image that shows up on Pinterest?
• Why does it seem that Quora's "moderators" base their moderations on personal beliefs and views by deleting answers that are only violating their personal feelings?
• Why is Russia always right? All eyes toward Russian glory!
• What is your craziest/worst Halloween story?
• What are 10 interesting facts about you?
• Why do almost all the girls on Quora look beautiful?
• The stage is set for Sunday drama at the US Open as Sam Burns leads Adam Scott and J.J. Spaun by one stroke - CNN
• Why is social media so anti-fee speech, and have they become total BS?
• Why is there a "double standard" applied to sex between a dog and a human? Why is it that to many who are at least mildly okay with bestiality, a WOMAN having sex with a male dog is fine, but a guy with a female dog is not?
• How many couples swap wives?
• Why does he text me first but when I never text first he gets mad?