The cafeteria bought (4/5) tons of flour, and after using (3/4) tons, bought (3/8) tons, how many tons of flour are there in the cafeteria now?
食堂买来面粉(4/5)吨，用去(3/4)吨后，又买来(3/8)吨，现在食堂有面粉多少吨？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/5) - (3/4)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(1/20) + (3/8)</gadget>
<output>17/40 = around 0.425</output>

<result>17/40 = around 0.425</result>