For a barrel of oil, 40% of it is used, which is exactly 120 kilograms. If 3/4 of the total is used, how many kilograms are used?
一桶油，用去它的40%，刚好120千克，如果用去总数的(3/4)，用去多少千克？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

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

<gadget id="calculator">300 * (3/4)</gadget>
<output>225</output>

<result>225</result>