A barrel of diesel oil has a capacity of 180 liters. One (1/6) of it is used for the first time, and the rest (2/5) is used for the second time. How many liters of diesel oil are used in total?
一桶容积是180升的柴油，第一次用去它的(1/6)，第二次用去了剩下的(2/5)，一共用去了多少升柴油？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/6) * (2/5)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/6) + (1/3)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">180 * (1/2)</gadget>
<output>90</output>

<result>90</result>