Xiaolan's family bought a bag of rice and ate 30 kilograms, which happened to be (3/5) of this bag of rice. How many kilograms are left in this bag of rice?
小兰家买来一袋大米，吃了30千克，正好是这袋大米的(3/5)．这袋大米还剩多少千克？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">30 / (3/5)</gadget>
<output>50</output>

<gadget id="calculator">50 - 30</gadget>
<output>20</output>

<result>20</result>