A batch of rice was shipped from the cafeteria. I ate (5/9) of this batch of rice on the first day, and the rest (1/5) on the second day. I ate the rest of the second day (1/5) on the third and fourth days. /4), and the rest (1/2) was eaten on the fifth day, and there were 40 kilograms left at this time. How many kilograms of this batch of rice are in total?
食堂运来一批大米，第一天吃了这批大米的(5/9)，第二天吃了余下的(1/5)，第三第四天都吃了第二天余下的(1/4)，第五天吃了余下的(1/2)，这时还剩40千克，这批大米共多少千克？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(4/9) * (1/5)</gadget>
<output>4/45 = around 0.088889</output>

<gadget id="calculator">1 - (5/9) - (4/45)</gadget>
<output>16/45 = around 0.355556</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(16/45) * (1/4)</gadget>
<output>4/45 = around 0.088889</output>

<gadget id="calculator">(16/45) - (4/45) - (4/45)</gadget>
<output>8/45 = around 0.177778</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(8/45) * (1/2)</gadget>
<output>4/45 = around 0.088889</output>

<gadget id="calculator">(8/45) - (4/45)</gadget>
<output>4/45 = around 0.088889</output>

<gadget id="calculator">40 / (4/45)</gadget>
<output>450</output>

<result>450</result>