The farm purchased 24 tons of fertilizer, used up 2/5 of it in January, and used up 35% of it in February. How many tons of fertilizer were used in two months?
农场购进24吨化肥，一月份用去它的(2/5)，二月份用去它的35%，两个月共用去化肥多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(2/5) + (7/20)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">24 * (3/4)</gadget>
<output>18</output>

<result>18</result>