A bookstore sells a kind of wall calendar, and can get a profit of 18 yuan for each copy sold. After a part is sold, the price of each copy is reduced by 10 yuan, and all are sold out. It is known that the number of copies sold at a reduced price is (2/3) of the number sold at the original price, and the bookstore makes a total profit of 2,870 yuan when the calendar is sold out. Ask the bookstore to sell a total of how many copies of the calendar?
某书店出售一种挂历，每售出1本可获得18元利润，售出一部分后，每本降价10元出售，全部售完．已知降价出售的本数是原价出售本数的(2/3)，书店售完这种挂历共获利2870元．求书店一共售出挂历多少本？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) * 18</gadget>
<output>54/5 = around 10.8</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 8</gadget>
<output>16/5 = around 3.2</output>

<gadget id="calculator">(54/5) + (16/5)</gadget>
<output>14</output>

<gadget id="calculator">2_870 / 14</gadget>
<output>205</output>

<result>205</result>