A pile of black and white Go pieces, from which 15 white stones are removed, the ratio of the number of remaining black stones to the number of white stones is 2:1, and 45 black stones are removed from it, and the ratio of the number of remaining black stones to the number of white stones is 1:5 , so how many pieces are there in total in this pile of Go pieces?
一堆黑白围棋子，从中取走了白子15粒，余下黑子数与白子数之比为2：1，此后又从中取走了黑子45粒，余下的黑子数与白子数之比为1：5，那么这堆围棋子原来共有多少粒？
<gadget id="calculator">75 * 5</gadget>
<output>375</output>

<gadget id="calculator">375 - 15</gadget>
<output>360</output>

<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">360 / 9</gadget>
<output>40</output>

<gadget id="calculator">40 - 15</gadget>
<output>25</output>

<gadget id="calculator">2 * 25</gadget>
<output>50</output>

<gadget id="calculator">40 + 50</gadget>
<output>90</output>

<result>90</result>