There are two piles of sand, A and B, and pile A is 350 tons more than pile B. When pile A is shipped out (5/7) and pile B is shipped out (3/5), the remaining tons of sand in the two piles are just equal. How many tons of sand was there in pile A?
有甲、乙两堆沙子，甲堆比乙堆多350吨，当甲堆运出(5/7)，乙堆运出(3/5)后，两堆沙子剩下的吨数正好相等．甲堆原来有沙子多少吨？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">350 / (2/7)</gadget>
<output>1_225</output>

<result>1_225</result>