A factory shipped a pile of coal, and used (2/5) tons in the first quarter, which was (1/5) less than in the second quarter. How many tons of coal are shared in the two quarters?
某工厂运来一堆煤，第一季度用去(2/5)吨，比第二季度少用去(1/5)吨．两个季度共用去煤多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) - (1/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/5) + (1/5)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>