It is known that the product of two factors is (3/5), one of which is (1/5), and what is the other factor.
已知两个因数的积是(3/5)，其中的一个因数是(1/5)，另一个因数是多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/5) / (1/5)</gadget>
<output>3</output>

<result>3</result>