6.6/2.1 What is the remainder when the quotient is 3.1?
6.6/2.1当商是3.1时余数是多少．
<gadget id="calculator">2.1 * 3.1</gadget>
<output>6.51</output>

<gadget id="calculator">6.6 - 6.51</gadget>
<output>0.09</output>

<result>0.09</result>