A photo is 10 cm long and 6 cm wide. If the width of the enlarged photo is to be 30 cm, how many centimeters should the length of the enlarged photo be?
一张照片长10厘米，宽6厘米．如果要使放大后照片的宽是30厘米，那么放大后照片的长应是多少厘米？
<gadget id="calculator">6 / 30</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<result>50</result>