A bag of rice weighs 75 kilograms, (3/5) has been eaten, and ((())/(())) of this bag of rice is left, how many kilograms are left.
一袋大米重75千克，已经吃了(3/5)，还剩这袋大米的((())/(()))，还剩下多少千克．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">75 * (2/5)</gadget>
<output>30</output>

<result>30</result>