The Zhenyu Jewelry Store bought 1,200 pearls and sold them (3/4). The remaining pearls are now divided into small boxes for sale. Each box contains 15 pearls on average. How many boxes do you need?
珍玉珠宝店购进1200个珍珠，已经卖出(3/4)，现要把剩下的珍珠用小盒分装后再卖，平均每盒装15个，要装几盒？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 15</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">1_200 * (1/60)</gadget>
<output>20</output>

<result>20</result>