The sales ratio of a certain home appliance company in September and October last year was 7:5, and the sales in September were 1 million more than in October. How much is the total sales in these two months?
某家电公司去年九月、十月销售额的比是7：5，九月比十月多销售100万元．这两个月销售总额为多少万元？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(7/12) - (5/12)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">100 / (1/6)</gadget>
<output>600</output>

<result>600</result>