Number A plus number B is 420, the quotient of number A divided by number B is 5, what is number A?
甲数加上乙数是420，甲数除以乙数的商是5，甲数是多少．
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">420 / 6</gadget>
<output>70</output>

<gadget id="calculator">420 - 70</gadget>
<output>350</output>

<result>350</result>