The students planted trees. The fourth grade planted 36 trees, and the sixth grade planted 12 trees three times less than the fourth grade. How many fewer plants are planted in the fourth grade than in the sixth grade?
同学们栽树，四年级栽了36棵，六年级栽的棵数比四年级的3倍少12棵．四年级比六年级少栽多少棵？
<gadget id="calculator">36 * 3</gadget>
<output>108</output>

<gadget id="calculator">108 - 12 - 36</gadget>
<output>60</output>

<result>60</result>