Master Wang wants to process a batch of parts. If 12 more parts are processed per hour, the time spent will be 1/9 less than the original plan; if 16 parts are processed per hour, the time used will be 3/5 hours longer than the original plan. How many parts are there in this batch?
王师傅要加工一批零件，若每小时多加工12个零件，则所用的时间比原计划少1/9；若每小时少加工16个，则所用的时间比原来多3/5小时．这批零件有多少个？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 - (1/9)</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 / (8/9)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">(9/8) - 1</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">12 / (1/8)</gadget>
<output>96</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">96 - 16</gadget>
<output>80</output>

<gadget id="calculator">80 / 96</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / (5/6)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) - 1</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/5) / (1/5)</gadget>
<output>3</output>

<gadget id="calculator">96 * 3</gadget>
<output>288</output>

<result>288</result>