The ratio of Li Xin's actual height to the height in the photo is 30:1. He is 4.2cm taller in the photo. What is his actual height in centimeters?
李欣的实际身高与照片中的身高的比是30：1，他在照片中高4.2cm，他的实际身高是多少厘米．
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">4.2 / (1/30)</gadget>
<output>126</output>

<result>126</result>