The reciprocal of a number is exactly 5% of 70. What is the number?
一个数的倒数正好是70的5%，这个数是多少．
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">70 * (1/20)</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">1 / (7/2)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>