Celebrating the Children's Day bookstore with 2450 new literary books, (3/7) of the new literary books is exactly equal to (2/3) of the original story books. How many original story books are there in the bookstore?
庆祝"六一"儿童节书店新进文艺书2450本，新进文艺书的(3/7)正好等于原有故事书的(2/3)．书店原有故事书多少本？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/7) / (2/3)</gadget>
<output>9/14 = around 0.642857</output>

<gadget id="calculator">2_450 * (9/14)</gadget>
<output>1_575</output>

<result>1_575</result>