A pile of cement (9/10) tons is less than B pile of cement (1/5). How many tons does B pile of cement weigh? How many columns
甲堆水泥(9/10)吨，比乙堆水泥少(1/5)，乙堆水泥重几吨？列式多少
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(9/10) / (4/5)</gadget>
<output>9/8 = around 1.125</output>

<result>9/8 = around 1.125</result>