The fifth grade in a certain school held a quick calculation competition. There were 1000 questions in total. Student A could calculate 30 questions per minute. Student B took 3 seconds less to calculate 50 questions than Student A did with the same number of questions. Student B was asked to complete 1000 questions How many questions did Student A still have to solve?
某校五年级进行速算比赛，共有1000道题，甲生每分钟可算30道题，乙生每算50道题比甲生算同样多的题目少用3秒钟，问乙生做完1000道题时，甲生还有多少道题没有做？
<gadget id="calculator">1_000 / 50</gadget>
<output>20</output>

<gadget id="calculator">50 / 30</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(5/3) - (1/20)</gadget>
<output>97/60 = around 1.616667</output>

<gadget id="calculator">30 * 20 * (97/60)</gadget>
<output>970</output>

<gadget id="calculator">1_000 - 970</gadget>
<output>30</output>

<result>30</result>