It is known that the product of two factors is 12, one of which is (2/5), and what is the other factor.
已知两个因数的积是12，其中一个因数是(2/5)，另一个因数是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">12 / (2/5)</gadget>
<output>30</output>

<result>30</result>