Primary school students in grade six planted 120 trees in spring, students in grade five planted 1/6 fewer trees than grade six, and planted 12 more trees than grade four. How many trees are planted in three grades?
小学六年级学生春季植树120棵，五年级学生比六年级少植树(1/6)，比四年级多植树12棵．三个年级共植树多少棵？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">120 * (5/6)</gadget>
<output>100</output>

<gadget id="calculator">100 - 12</gadget>
<output>88</output>

<gadget id="calculator">120 + 100 + 88</gadget>
<output>308</output>

<result>308</result>