A's number is 280, which is 7 times that of B's number. What is the sum of A's and B's numbers?
甲数是280，是乙数的7倍，甲乙两数的和是多少．
<gadget id="calculator">280 / 7</gadget>
<output>40</output>

<gadget id="calculator">40 + 280</gadget>
<output>320</output>

<result>320</result>