There are two barrels of oil, the masses are (15/2) kg and (21/4) kg respectively, put these two barrels of oil into small bottles, each small bottle contains (3/4) kg, how many bottles can be filled in total?
有两桶油，质量分别为(15/2)kg和(21/4)kg，将这两桶油分装在小瓶里，每小瓶装(3/4)kg，共能装多少瓶？
<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">21 / 4</gadget>
<output>21/4 = around 5.25</output>

<gadget id="calculator">(15/2) + (21/4)</gadget>
<output>51/4 = around 12.75</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(51/4) / (3/4)</gadget>
<output>17</output>

<result>17</result>