There are three boxes of balls A, B, and C. The number of balls in box A is 75% more than that in box B. The number of balls in box B is twice that of box C. Now take 5 balls from box A and put them in the box. Put them into box B, and then take out how many balls from box A and put them into box C, so that the ratio of the number of balls in the three boxes is 10:9:7.
有甲乙丙三盒小球，甲盒中的小球数量比乙盒中的小球多75%，乙盒中小球数量是丙盒的2倍，现在从甲盒中拿出5个小球放入乙盒，再从甲盒中拿出多少个放入丙盒，使得三盒中小球数量的比是10：9：7．
<gadget id="calculator">10 + 9 + 7</gadget>
<output>26</output>

<gadget id="calculator">9 / 26</gadget>
<output>9/26 = around 0.346154</output>

<gadget id="calculator">7 + 4 + 2</gadget>
<output>13</output>

<gadget id="calculator">4 / 13</gadget>
<output>4/13 = around 0.307692</output>

<gadget id="calculator">(9/26) - (4/13)</gadget>
<output>1/26 = around 0.038462</output>

<gadget id="calculator">5 / (1/26)</gadget>
<output>130</output>

<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">130 * (7/13)</gadget>
<output>70</output>

<gadget id="calculator">10 / 26</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">130 * (5/13)</gadget>
<output>50</output>

<gadget id="calculator">70 - 5 - 50</gadget>
<output>15</output>

<result>15</result>