SOLUTION: three fourths of an ounce of medication are required for a 120 lb adult, at the same rate, how many additional ounces are required for a 200 lb adult..show equation..this one reall

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: three fourths of an ounce of medication are required for a 120 lb adult, at the same rate, how many additional ounces are required for a 200 lb adult..show equation..this one reall      Log On


   

Question 357151: three fourths of an ounce of medication are required for a 120 lb adult, at the same rate, how many additional ounces are required for a 200 lb adult..show equation..this one really confuses me
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = amount of medication for a 200 lb adult (in ounces)


So then we have the ratio %283%2F4%29%2F120=x%2F200


%283%2F4%29%2F120=x%2F200 Start with the given equation.


%283%2F4%29200=120x Cross multiply


150=120x Multiply 3%2F4 and 200 to get 600%2F4=150


150%2F120=x Divide both sides by 120.


5%2F4=x Reduce.


So x=5%2F4 which means that a 200 lb adult needs 5%2F4 of an ounce of medication.

Put another way, a 200 lb adult needs 1%261%2F4 ounces of medication (since 5%2F4=1%261%2F4)