Xiao Ming has done 48 math problems and has completed 16. How much of all the problems still need to be completed?
小明做48道数学题，已完成了16道，还需完成全部题目的多少
<gadget id="calculator">48 - 16</gadget>
<output>32</output>

<gadget id="calculator">32 / 48</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>