After removing the decimal part from a decimal, an integer is obtained, and this integer is added to the product of the original decimal and 4 to obtain 27.6. What is the original number.
一个小数去掉小数部分后得到一个整数，这个整数加上原来的小数与4的乘积，得27.6．原来这个小数是多少．
<result>5.65</result>