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=<T>multiply(30, 0.2)=6.0 people who didn't show up
So 30-6=<T>subtract(30, 6)=24 people showed up
Of the people who showed up, 24*.75=<T>multiply(24, 0.75)=18.0 got steak
So 24-18=<T>subtract(24, 18)=6 got chicken
