In a workshop, the task of processing parts was divided between the apprentice and the master according to the ratio of 3:5. The master actually processed 180 parts, exceeding 20% of the original assigned task. How many parts did the apprentice originally plan to process?
某车间把加工的零件任务按3：5分给徒弟和师傅俩人，师傅实际加工了180个，超过原分配任务的20%，原计划徒弟加工多少个零件？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(5/8) * (6/5)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">180 / (3/4)</gadget>
<output>240</output>

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

<gadget id="calculator">240 * (3/8)</gadget>
<output>90</output>

<result>90</result>