(4/5) of a number is (3/10), what is this number?
一个数的(4/5)是(3/10)，这个数是多少？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(3/10) / (4/5)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>