In the expenditure of Guangming Primary School in December, the water fee accounts for about 1/4 of the total expenditure, the electricity fee accounts for about 2/5 of the total expenditure, and the rest is other expenditures, which account for a fraction of the total expenditure. Several?
光明小学在12月份的支出中，水费约占总支出的(1/4)，电费约占总支出的(2/5)，剩下的是其它支出，其它支出占总支出的几分之几？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/4) - (1/5)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>