A number, if its decimal part is enlarged by 3 times, the number is 2.2, if its decimal part is enlarged by 7 times, the number is 3.8, what is the original number?
一个数，如果把它的小数部分扩大3倍，这个数是2.2，如果把它的小数部分扩大7倍，这个数是3.8，原来这个数是多少．
<result>1.4</result>