The students planted trees. The fourth grade planted 43 trees, and the fifth grade planted 15 trees three times less than the fourth grade. How many fewer plants are planted in the fourth grade than in the fifth grade?
同学们栽树，四年级栽了43棵，五年级栽的棵数比四年级的3倍少15棵．四年级比五年级少栽多少棵？
<gadget id="calculator">43 * 3</gadget>
<output>129</output>

<gadget id="calculator">129 - 15 - 43</gadget>
<output>71</output>

<result>71</result>