For a batch of cement (5/3) tons, (3/4) of the total amount is used on the first day, and (1/5) of the first day is used on the second day. How many tons of cement are used on the second day?
一批水泥(5/3)吨，第一天用去总量的(3/4)，第二天用去的是第一天的(1/5)，第二天用去水泥多少吨？
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(5/3) * (3/4) * (1/5)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>