A store buys several kilograms of cucumbers at the price of 2 kilograms for one yuan, and if they sell half and 60 kilograms at 0.6 yuan per kilogram, the cost will be fully recovered at this time. How many kilograms of cucumbers to buy.
某商店按一元钱2千克买进若干千克黄瓜，如果按每千克0.6元卖出一半又60千克后，这时成本全部收回．买进黄瓜多少千克．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">0.6 / 2</gadget>
<output>0.3</output>

<gadget id="calculator">(1/2) - 0.3</gadget>
<output>0.2</output>

<gadget id="calculator">0.6 / 0.2</gadget>
<output>3</output>

<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<result>180</result>