The sum of 7 consecutive natural numbers is 280, what is the largest number among them?
7个连续自然数的和是280，其中最大的那个数是多少．
<gadget id="calculator">280 / 7</gadget>
<output>40</output>

<gadget id="calculator">40 + 3</gadget>
<output>43</output>

<result>43</result>