In proportion, the product of two inner terms is 6, one of which is (2/3), and what is the other outer term.
在比例中，两个内项的积是6，其中一个外项是(2/3)，另一个外项是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 / (2/3)</gadget>
<output>9</output>

<result>9</result>