There are two barrels of oil with a mass of (15/2) kilograms and (21/4) kilograms. Now put them in small bottles respectively, and each small bottle contains (3/4) kilograms. How many bottles can be filled in total?
有两桶质量分别为(15/2)千克和(21/4)千克的油，现将它们分别装在小瓶里，每个小瓶装(3/4)千克，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>