Grandpa raised 820 white rabbits, 120 more than black rabbits. How many rabbits did grandpa raise in total?
爷爷养白兔820只，比黑兔多120只，爷爷家一共养了多少只兔？
<gadget id="calculator">820 - 120</gadget>
<output>700</output>

<gadget id="calculator">700 + 820</gadget>
<output>1_520</output>

<result>1_520</result>