21.4 divided by 15 quotient 1.4, what is the remainder
21.4除以15商1.4，余数是多少
<gadget id="calculator">15 * 1.4</gadget>
<output>21</output>

<gadget id="calculator">21.4 - 21</gadget>
<output>0.4</output>

<result>0.4</result>