A pile of coal used (4/5) tons yesterday, but today (1/4) tons more than yesterday, how many tons are used in two days? what is the correct formula
一堆煤，昨天用去(4/5)吨，今天比昨天多用了(1/4)吨，两天一共用去多少吨？正确算式是多少
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) + (1/4) + (4/5)</gadget>
<output>37/20 = around 1.85</output>

<result>37/20 = around 1.85</result>