Final answer to the problem
$161$
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1
Apply the formula: $a+b$$=a+b$, where $a=20$, $b=90$ and $a+b=20+90+51$
$110+51$
2
Apply the formula: $a+b$$=a+b$, where $a=110$, $b=51$ and $a+b=110+51$
$161$
Final answer to the problem
$161$
