In a ratio, if the product of two outer terms is 1 and one of the inner terms is (7/15), what is the other inner term.
在一个比例中，如果两个外项的积是1，其中一个内项是(7/15)，则另一个内项是多少．
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">1 / (7/15)</gadget>
<output>15/7 = around 2.142857</output>

<result>15/7 = around 2.142857</result>