Xiao Ming's current weight is 30 kg, which is (1/5) more than last year. How many kilograms did Xiao Ming weigh last year?
小明现在的体重是30千克，比去年增加了(1/5)．小明去年体重是多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">30 / (6/5)</gadget>
<output>25</output>

<result>25</result>