(8/9) of a number is (4/15), find this number.
一个数的(8/9)是(4/15)，求这个数．
<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">(4/15) / (8/9)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>