The dividend is 1.6 smaller than the divisor, the quotient is (3/5), what is the divisor?
被除数比除数小1.6，商是(3/5)，除数是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1.6 / (2/5)</gadget>
<output>4</output>

<result>4</result>