Please fill in a number above the horizontal line to make the equation true: 5*4/how much=0.8.
请在横线上方填入一个数，使等式成立：5*4/多少=0.8．
<gadget id="calculator">4 / 0.8</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>