A bag of rice weighs 5 kilograms. The first time I ate (1/5) of it, the second time I ate more (1/8) than the first time. What fraction of the bag of rice is left?
一袋大米重5千克，第一次吃了它的(1/5)，第二次比第一次多吃了(1/8)，还剩这袋大米的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 + (1/8)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">(1/5) * (9/8)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">1 - (1/5) - (9/40)</gadget>
<output>23/40 = around 0.575</output>

<result>23/40 = around 0.575</result>