(2/3) of a number is equal to (4/5) of 30. What is this number?
一个数的(2/3)等于30的(4/5)，这个数是多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(4/5) / (2/3)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">30 * (6/5)</gadget>
<output>36</output>

<result>36</result>