bag of rice weighs 80 kilograms. If you use up (3/8) of it for the first time and use up the rest (2/5) for the second time, how many kilograms are left?
一袋米重80千克，第一次用去它的(3/8)，第二次用去余下的(2/5)，还剩多少千克？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/8) * (2/5)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (3/8) - (1/4)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">80 * (3/8)</gadget>
<output>30</output>

<result>30</result>