A pile of yellow sand is 30 cubic meters, the first use (1/5) of the total amount, the second use (2/3) of the first use, how many cubic meters is used the second time?
一堆黄沙30立方米，第一次用去总数的(1/5)，第二次用去第一次用的(2/3)，第二次用去多少立方米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">30 * (1/5) * (2/3)</gadget>
<output>4</output>

<result>4</result>