What is the quotient of 30 plus 25 (4/5) and dividing (9/10)?
用30加上25个(4/5)所得的和去除(9/10)，商是多少？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * 25</gadget>
<output>20</output>

<gadget id="calculator">30 + 20</gadget>
<output>50</output>

<gadget id="calculator">(9/10) / 50</gadget>
<output>9/500 = around 0.018</output>

<result>9/500 = around 0.018</result>