Draw a square with a side length of 12 cm on a drawing at a ratio of 1:4, what is the side length on the drawing in cm?
把一个边长是12厘米的正方形按1：4画在图纸上，图纸上的边长是多少厘米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12 * (1/4)</gadget>
<output>3</output>

<result>3</result>