A pile of 260 tons of sand and gravel, 30% of the total amount was removed in the first 5 days, and 45% of the total amount was removed in the next 3 days. How many tons of sand and gravel are left?
一堆260吨的砂石，前5天运走总数的30%，后3天运走总数的45%，还剩下多少吨砂石没有运走？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (3/10) - (9/20)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">260 * (1/4)</gadget>
<output>65</output>

<result>65</result>