There are some apples in the store. The unit price ratio of big apples to small apples is 3:2, and the quality ratio is 4:7. After selling these apples, they sold a total of 1560 yuan. How much did the big apples sell in total?
商店有一些苹果，其中大苹果与小苹果的单价比是3：2，质量比是4：7．售完这些苹果后，共卖得1560元，求大苹果一共卖了多少钱？
<gadget id="calculator">6 + 7</gadget>
<output>13</output>

<gadget id="calculator">6 / 13</gadget>
<output>6/13 = around 0.461538</output>

<gadget id="calculator">1_560 * (6/13)</gadget>
<output>720</output>

<result>720</result>