There is a barrel of oil in the school cafeteria, which was used in May (2/5), and there is 48 kg of oil left in the barrel. The barrel of oil was used in June (1/4), how much is the weight of the oil used in June?
学校食堂有一桶油，五月份用去(2/5)，桶里还剩48千克油，六月份用去这桶油的(1/4)，六月份用去的油重多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">48 / (3/5)</gadget>
<output>80</output>

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

<gadget id="calculator">80 * (1/4)</gadget>
<output>20</output>

<result>20</result>