Xiaoqiang's weight this year is 54 kg, which is 1/9 more than last year. What was Xiaoqiang's weight last year?
小强今年的体重是54千克，比去年增加了(1/9)，小强去年的体重是多少千克．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 + (1/9)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">54 / (10/9)</gadget>
<output>243/5 = around 48.6</output>

<result>243/5 = around 48.6</result>