Investigate (1/5) the number of people in class A to class B, the number of the two classes is equal, the original number of people in class B is the number of class A
把甲班人数的(1/5)调查给乙班，两班人数相等，原来乙班人数是甲班的多少
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>