The students collected tree species, the fourth grade collected 16 kilograms, the third grade collected the weight of the fourth grade (3/4), and the sixth grade (1/2), how many kilograms of tree species were collected by the sixth grade?
同学们采集树种，四年级采集了16千克，三年级采集的重量是四年级的(3/4)，又是六年级的(1/2)，六年级采集树种多少千克？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">16 * (3/4)</gadget>
<output>12</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">12 / (1/2)</gadget>
<output>24</output>

<result>24</result>