Fangfang's grandma brought 20 yuan to buy silver carp. It is 8.6 yuan per kilogram of silver carp. If you buy 1.9 kilograms, how much money is left?
方方的奶奶带了20元钱去买花鲢鱼．每千克花鲢鱼8.6元，买了1.9千克，还剩多少钱？
<gadget id="calculator">8.6 * 1.9</gadget>
<output>16.34</output>

<gadget id="calculator">20 - 16.34</gadget>
<output>3.66</output>

<result>3.66</result>