A cabbage test field is triangular in shape, with a base of 24 decimeters and a height of 21 decimeters. If each cabbage covers an average area of 9 square decimeters, how many cabbages can be planted in this field?
一块白菜试验田的形状是三角形的，底是24分米，高是21分米，如果平均每棵白菜占地9平方分米，这块地一共可以种多少棵白菜？
<gadget id="calculator">21 / 2 / 9</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">24 * (7/6)</gadget>
<output>28</output>

<result>28</result>