The original grain shop had (3/5) tons of rice, and (1/4) tons were shipped in, and (3/4) tons were sold. How many tons are left?
粮店原有大米(3/5)吨，又运来(1/4)吨，卖出(3/4)吨．还剩多少吨？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) - (3/4)</gadget>
<output>-1/2 = around -0.5</output>

<gadget id="calculator">(3/5) + (-1/2)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>