There are two piles of sand. It turns out that pile A has 7.5 tons more sand than pile B. After transporting 15.3 tons from pile A, the ratio of sand in pile A to pile B is 3:5. How many tons of sand is in pile B?
有两堆沙，原来甲堆的沙比乙堆多7.5吨．从甲堆运走15.3吨后，这时甲堆的沙与乙堆的比是3：5．乙堆的沙有多少吨？
<gadget id="calculator">15.3 - 7.5</gadget>
<output>7.8</output>

<gadget id="calculator">3 / 5</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">7.8 / (2/5)</gadget>
<output>19.5</output>

<result>19.5</result>