If 5 tons of yellow sand are transported from the construction site, (2/5) tons are used on the first day, which is less than (1/4) tons on the second day. How many tons are used in two days?
建筑工地运来5吨黄沙，第一天用去(2/5)吨，比第二天少用去(1/4)吨，两天共用去多少天吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) + (2/5) + (1/4)</gadget>
<output>21/20 = around 1.05</output>

<result>21/20 = around 1.05</result>