A pile of apples, A took away all (1/3), B took away 20% of all, C took away (1/2) of both A and B, and there are still 12 apples left, the pile of apples How many were there?
一堆苹果，甲取走了全部的(1/3)，乙取走全部的20%，丙取走了甲乙两人的(1/2)，这时还剩下12个苹果，这堆苹果原来有多少个？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) + (1/5)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(8/15) * (1/2)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1 - (4/15) - (1/3) - (1/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">12 / (1/5)</gadget>
<output>60</output>

<result>60</result>