Most of the earth's surface is covered by oceans, the Pacific Ocean accounts for about (1/3) of the Earth's surface, and the Atlantic Ocean accounts for about (1/5) of the Earth's surface. What fraction of the Earth's surface are these two oceans?
地球的表面大部分被海洋覆盖，太平洋约占地球表面的(1/3)，大西洋约占地球表面的(1/5)．这两个洋的面积一共约占地球表面的几分之几？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) + (1/5)</gadget>
<output>8/15 = around 0.533333</output>

<result>8/15 = around 0.533333</result>