During the May 1st Golden Week in 2007, the number of tourists received by Mengshan Tourist Area accounted for 30% of the city’s total, and the number of tourists received by Tianfoshan Tourist Area in Junan accounted for 5% of the total number of tourists received by the city. Tianfoshan Tourist Area received fewer tourists than Mengshan Tourist Area. 420,000 passengers. How many million tourists did the city receive in total?
2007年五一黄金周期间，蒙山旅游区接待游客占全市接待游客的30%，莒南天佛山旅游区接待旅客占全市接待游客的5%，天佛山旅游区比蒙山旅游区少接待游客42万人次．全市一共接待游客多少万人次？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(3/10) - (1/20)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">42 / (1/4)</gadget>
<output>168</output>

<result>168</result>