Two numbers are reciprocals of each other, one of which is (4/7), and the other is what.
两个数互为倒数，其中一个数是(4/7)，另一个数是多少．
<gadget id="calculator">7 / 4</gadget>
<output>7/4 = around 1.75</output>

<result>7/4 = around 1.75</result>