A new batch of pens has been purchased in the school store. The wholesale price is 3 yuan each, and the current price is 5 yuan each. When there are 20 pens left, the profit has been 80 yuan. How many pens did the store buy in total?
学校商店新进一批钢笔，批发价为3元一支，现售价5元一支，当卖到还剩20支是，已经获利80元，这个商店一共进了多少支钢笔？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">40 + 20</gadget>
<output>60</output>

<result>60</result>