The ratio of red balls to white balls in the bag is 19:13. After putting in several red balls, the ratio of red balls to white balls is 5:3, and after putting in several white balls, the ratio of red balls to white balls is 13:11. It is known that there are 80 more white balls than red balls. So how many whites are there in the original bag?
袋子里红球与白球的个数比是19：13．放入若干只红球后，红球与白球数量之比是5：3，放入若干只白球后，红球与白球数量之比是13：11．已知放入的白球比红球多80只．那么原来袋子中有白多少只．
<gadget id="calculator">55 - 39</gadget>
<output>16</output>

<gadget id="calculator">65 - 57</gadget>
<output>8</output>

<gadget id="calculator">16 - 8</gadget>
<output>8</output>

<gadget id="calculator">80 / 8</gadget>
<output>10</output>

<gadget id="calculator">10 * 39</gadget>
<output>390</output>

<result>390</result>