Four integers form a ratio, they are: the smallest prime number, the smallest two-digit number, and 7, so what is the fourth integer.
四个整数组成比例，它们分别是：最小的素数，最小两位数，还有7，则第四个整数是多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">7 / (1/5)</gadget>
<output>35</output>

<result>35</result>