In the sunlight, Yaya measures the ratio of her height to the length of her shadow, which is 2:3. At this time, the shadow length of the school library is 20 meters. Find the height of the library building in meters.
在阳光下，丫丫测量自己的身高和影子的长度比是2：3，这时学校图书馆的影长为20米，求图书馆楼房的高度是多少米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 20</gadget>
<output>40/3 = around 13.333333</output>

<result>40/3 = around 13.333333</result>