If the base of the triangle is enlarged by 10 times, the area should be enlarged by 4 times, what is the height?
三角形的底扩大10倍，要使面积扩大4倍，高应该多少．
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>