Final answer to the problem
$621$
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1
Apply the formula: $a+b$$=a+b$, where $a=20$, $b=90$ and $a+b=20+90+511$
$110+511$
2
Apply the formula: $a+b$$=a+b$, where $a=110$, $b=511$ and $a+b=110+511$
$621$
Final answer to the problem
$621$
