The working efficiency ratio of A's number to B's number is 6:5, and two people work together to make 880 parts, so how many fewer parts can be made by B than A.
甲数是乙数的工作效率比为6：5，两人合做零件880个，则乙比甲少做多少个．
<gadget id="calculator">6 + 5</gadget>
<output>11</output>

<gadget id="calculator">6 / 11</gadget>
<output>6/11 = around 0.545455</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">(6/11) - (5/11)</gadget>
<output>1/11 = around 0.090909</output>

<gadget id="calculator">880 * (1/11)</gadget>
<output>80</output>

<result>80</result>