When Xiaohua calculated 1.8 divided by a number, because the decimal point of the quotient was wrong by one place to the left, the result was 15. What is the divisor for this question.
小华计算1.8除以一个数时，由于商的小数点向左错了一位，结果是15，这道题除数是多少．
<result>1.2</result>