(2/9) of a number is (1/5), what is this number? what is the correct formula
一个数的(2/9)是(1/5)，这个数是多少？正确算式是多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(1/5) / (2/9)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>