There are 10 kilograms of rice in a bucket. After using (1/10) of it, put (1/10) kilograms of rice in it. How many kilograms of rice are in the bucket at this time?
一只桶里有米10千克，用了它的(1/10)后，再放入(1/10)千克米．这时桶里有米多少千克．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">10 * (9/10)</gadget>
<output>9</output>

<gadget id="calculator">9 + (1/10)</gadget>
<output>91/10 = around 9.1</output>

<result>91/10 = around 9.1</result>