In order to create a strong education district in Huadu District, it is planned that the first batch of high-level schools will account for (1/2) of the total number of schools in the district, and the second batch of high-level schools will account for (1/3) of the total number of schools in the district. What percentage of the total number of schools in the district are unranked schools?
花都区为创建教育强区，计划第一批上等级学校占全区学校总数的(1/2)，第二批上等级学校占全区学校总数的(1/3)．没有上等级的学校占全区学校总数的几分之几？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>