In a certain decimal division calculation problem, the product of the dividend, the divisor and the quotient is 0.64. If the divisor is 0.4, what is the quotient?
在某道小数除法计算题中，被除数、除数及商的乘积是0.64．如果除数是0.4，那么商是多少？
<gadget id="calculator">0.8 / 0.4</gadget>
<output>2</output>

<result>2</result>