On Sunday, the students from Class 1 of the fifth grade visited the museum. The whole class (2/5) went to the British Pavilion, (3/8) the students went to the Spanish Pavilion, and the rest of the students visited the China Pavilion. What percentage of the class do the visiting students account for?
星期日，五年级一班的同学去世博馆参观，全班(2/5)的同学去了英国馆，(3/8)的同学去了西班牙馆，其余的同学到中国馆参观，到中国馆参观的同学占全班的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (2/5) - (3/8)</gadget>
<output>9/40 = around 0.225</output>

<result>9/40 = around 0.225</result>