The school carried out tree planting activities. A total of 60 trees will be planted. The upper grades will be responsible for planting (3/5), and the rest will be planted for the middle and lower grades. How many trees should the middle and lower grades plant?
学校开展植树活动，共要植树60棵，高年级负责栽种(3/5)，剩下的给中、低年级栽种，中、低年级要植树多少棵？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">60 * (3/5)</gadget>
<output>36</output>

<gadget id="calculator">60 - 36</gadget>
<output>24</output>

<result>24</result>