What is the area of a parallelogram with a base of 20 cm and a height of 4 cm reduced by 1:4?
将一个底20厘米，高4厘米的平行四边形按1：4缩小后，面积是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * (1/4)</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">20 * 4 * (1/16)</gadget>
<output>5</output>

<result>5</result>