The three sides of a triangular land are 54 meters, 30 meters and 84 meters respectively. Trees should be planted on the three sides with a distance of 6 meters.
一块三角形地三边分别是54米30米84米要在三边上植树，株距6米，三个角上各种一棵，共植树多少棵．
<gadget id="calculator">54 + 30 + 84</gadget>
<output>168</output>

<gadget id="calculator">168 / 6</gadget>
<output>28</output>

<result>28</result>