There are 40 students in class 6 and 2 taking the math test, and the pass rate is 97.5%. How many students failed this test?
六2班有40个同学参加数学考试，及格率是97.5%，这次考试有多少个同学不及格？
<gadget id="calculator">97.5 / 100</gadget>
<output>0.975</output>

<gadget id="calculator">1 - 0.975</gadget>
<output>0.025</output>

<gadget id="calculator">40 * 0.025</gadget>
<output>1</output>

<result>1</result>