The school shipped two bundles of saplings, a total of 240. It is going to be distributed to the fourth, fifth, and sixth grades. The total number of trees planted in the sixth grade (5/12), the ratio of the number of trees planted in the fourth and fifth grades is 3:4. How many trees should be planted in the fourth grade.
学校运来两捆树苗，共240棵．准备分给四、五、六年级栽种，六年级栽总棵数的(5/12)，四、五年级栽的棵数比是3：4．四年级应栽种多少棵．
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (5/12)</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">240 * (7/12) * (3/7)</gadget>
<output>60</output>

<result>60</result>