After a basket of apples is sold (1/5), another 10 kg is sold. At this time, the selling weight is exactly the remaining (1/2). How many kilograms did this basket of apples originally weigh?
一筐苹果卖掉(1/5)后，又卖掉10千克．这时卖出的重量正好是剩下的(1/2)．这筐苹果原来有多少千克？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

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

<gadget id="calculator">(1/5) * 3</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / (2/5)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">10 * (15/2)</gadget>
<output>75</output>

<result>75</result>