It is obvious that 8 sheets of paper are to be copied, and both sides must be copied. If a maximum of 4 sheets are printed at a time, each printing takes 1 minute. How long will it take at least to print these sheets?
明明要复印8张纸，正反面都要复印，如果每次最多印4张，每印一次需要1分钟，印完这些纸至少需要多少分钟．
<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">8 * (1/2) * 1</gadget>
<output>4</output>

<result>4</result>