The two piles of sand weigh 10.5 tons in total. Put (1/5) of the sand in pile B into pile A. At this time, the weight ratio of the two piles of sand in A and B is 1.5:1. How many tons did the two piles of sand in A and B originally weigh?
两堆沙子共重10.5吨，把乙堆沙子的(1/5)放到甲堆里，这时甲乙两堆沙子的重量比是1.5：1，甲乙两堆沙子原来各重多少吨？
<gadget id="calculator">1.5 + 1</gadget>
<output>2.5</output>

<gadget id="calculator">1 / 2.5</gadget>
<output>0.4</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">0.4 / (4/5)</gadget>
<output>0.5</output>

<gadget id="calculator">10.5 * 0.5</gadget>
<output>5.25</output>

<gadget id="calculator">10.5 - 5.25</gadget>
<output>5.25</output>

<result>5.25</result>