A cylindrical bucket with a bottom area of 40 square decimeters contains some water. A conical part with a base area of 12 square decimeters is completely submerged in water, and the water level rises by 0.15 decimeters (no water overflows). How tall is this part?
一个圆柱形的水桶，底面积是40平方分米，里面装了一些水．把一个底面积为12平方分米的圆锥形零件完全浸没在水中，水面升高了0.15分米(没有水溢出)．这个零件高多少？
<gadget id="calculator">40 * 0.15</gadget>
<output>6</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">6 * (1/4)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>