There are some albums of "We Love Science" in the bookstore, 60% of the total were sold during June 1st, and another 192 copies were shipped in. At this time, the ratio of the number of albums to the original number is 6:7. How many original albums are there in the book city?
书城里有一些《我们爱科学》画册，六一期间卖出总数的60%，又运来192本，这时画册的本数与原来本数的比是6：7．书城原有画册多少本？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(6/7) - (2/5)</gadget>
<output>16/35 = around 0.457143</output>

<gadget id="calculator">192 / (16/35)</gadget>
<output>420</output>

<result>420</result>