According to statistics, in the world's total oil reserves, the Gulf region accounts for about (13/20) of the total reserves. By what fraction are the oil reserves in the Gulf region larger than in other regions?
据统计，在世界石油总储量中，海湾地区约占总储量的(13/20)．海湾地区的石油储量比其他地区多几分之几？
<gadget id="calculator">13 / 20</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1 - (13/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(13/20) - (7/20)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) / (7/20)</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>