There are 120 red balls and 40 blue balls in bag A, and 360 red balls and 80 blue balls in bag B, how many blue balls should be taken from bag A to make the percentage of red balls in the two bags the same Equal exchange with the red balls in bag B?
甲袋中有红球120个、蓝球40个，乙袋中有红球360个、蓝球80个，要使两袋中红球所占的百分数一样，应从甲袋中取多少个蓝球与乙袋中的红球进行等量交换？
<gadget id="calculator">360 * 120</gadget>
<output>43_200</output>

<gadget id="calculator">360 * 40</gadget>
<output>14_400</output>

<gadget id="calculator">120 * 360</gadget>
<output>43_200</output>

<gadget id="calculator">120 * 80</gadget>
<output>9_600</output>

<gadget id="calculator">14_400 - 43_200 - 9_600</gadget>
<output>-38_400</output>

<gadget id="calculator">43_200 + (-38_400)</gadget>
<output>4_800</output>

<gadget id="calculator">360 + 80 + 120 + 40</gadget>
<output>600</output>

<gadget id="calculator">4_800 / 600</gadget>
<output>8</output>

<result>8</result>