The number of A is (8/9), which is equivalent to (4/5) of the number B. What is the B number?
甲数是(8/9)，相当于乙数的(4/5)．乙数是多少？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

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

<gadget id="calculator">(8/9) / (4/5)</gadget>
<output>10/9 = around 1.111111</output>

<result>10/9 = around 1.111111</result>