Yangshan Primary School participated in the tree planting activity and distributed 240 trees to the fourth, fifth and sixth grades according to the ratio of 2:3:5. How many more trees were planted in sixth grade than in fourth grade?
阳山小学参加植树活动，把240棵树按2：3：5分配给四、五、六三个年级．六年级比四年级多植了多少棵？
<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">240 * (1/2)</gadget>
<output>120</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">240 * (1/5)</gadget>
<output>48</output>

<gadget id="calculator">120 - 48</gadget>
<output>72</output>

<result>72</result>