In 1838, the state of Massachusetts passed a temperance law banning the sale of spirits in less than 15-gallon quantities; though the law was repealed two years later, it set a precedent for such legislation. Maine passed the first state prohibition laws in 1846, followed by a stricter law in 1851. A number of other states had followed suit by the time the Civil War began in 1861.
15/20=0.75
if we said that each ( child = 0.75 adult )
20 total children num - 9 children in the elevator = 11 children not in the elevator.
11 children * 0.75 adult = 8.25 adults.
that is the math, in real life 8 adults can get in with 9 children.
hope that helps!
