math

at his birthday party, mr. green wouldnt directly tell how old he was. he said." if you add the year of my birth to this year, subtract the year of my tenth birthday and the year of my fiftieth birthday, and then add my present age, the result is 80" how old is mr. green?

what variables do i use??
let x=year born
let x+10=10t bday
let X+50= 50th bday
ley?????= age

80. Duh. Ain't the answer in there?


And theres another Mr Green. Heres mr green!

The answer I get is 10 years old...