A pile of lime weighs (9/4) tons, and the remaining part is 40% less than the used one. How many tons are left?
一堆石灰重(9/4)吨，用去一部分后剩下的比用去的少40%，剩下多少吨？
<gadget id="calculator">9 / 4</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 + (3/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">(9/4) / (8/5)</gadget>
<output>45/32 = around 1.40625</output>

<gadget id="calculator">(45/32) * (3/5)</gadget>
<output>27/32 = around 0.84375</output>

<result>27/32 = around 0.84375</result>