Subtract the product of 0.8 and 5 from 4.05, divide the difference by 0.5, what is the quotient?
从4.05里减去0.8与5的积，所得的差再除以0.5，商是多少？
<gadget id="calculator">0.8 * 5</gadget>
<output>4</output>

<gadget id="calculator">4.05 - 4</gadget>
<output>0.05</output>

<gadget id="calculator">0.05 / 0.5</gadget>
<output>0.1</output>

<result>0.1</result>