A bottle of 2.5 liters of beverage is poured out (2/5) for the first time, and (1/8) is poured out for the second time, what fraction of the bottle is left?
一瓶2.5升的饮料，第一次倒出它的(2/5)，第二次倒出它的(1/8)，还剩这瓶饮料的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (2/5) - (1/8)</gadget>
<output>19/40 = around 0.475</output>

<result>19/40 = around 0.475</result>