John has a party and invites 30 people.  Of the people he invited 20% didn't show up.  75% of the people who show up get steak and the rest get chicken.  How many people ordered chicken?
There were 30*.2=
<gadget id="calculator">30*.2</gadget>
<output>6</output>
6 people who didn't show up.
So 30-6=
<gadget id="calculator">30-6</gadget>
<output>24</output>
24 people showed up.
Of the people who showed up, 24*.75=
<gadget id="calculator">24*.75</gadget>
<output>18</output>
18 got steak.
So 24-18=
<gadget id="calculator">24-18</gadget>
<output>6</output>
6 got chicken.

<result>6</result>