The two piles of goods A and B weigh 80 tons in total. If you put (1/5) of pile A into pile B, the weight ratio of piles A and B is 3:2. How many tons did pile A weigh?
甲、乙两堆货物共重80吨，如果把甲堆的(1/5)放进乙堆，则甲、乙两堆的重量比是3：2，甲堆原来重多少吨？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(3/5) / (4/5)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">80 * (3/4)</gadget>
<output>60</output>

<result>60</result>