If 500 sheets of white paper are 7 cm, how many sheets of white paper are 49 cm thick.
如果500张白纸为7厘米，那么多少张白纸的厚度是49厘米．
<gadget id="calculator">49 / 7</gadget>
<output>7</output>

<gadget id="calculator">7 * 500</gadget>
<output>3_500</output>

<result>3_500</result>