When calculating 25.7/1.2, the quotient is 21, what is the remainder
在计算25.7/1.2时，商是21，余数是多少
<gadget id="calculator">21 * 1.2</gadget>
<output>25.2</output>

<gadget id="calculator">25.7 - 25.2</gadget>
<output>0.5</output>

<result>0.5</result>