SOLUTION: a saline solution has a concentration ratio of 2.5 mg of salt in 100 ml of solution how many milligrams of salt will be needed to produce 500 milliliters of a saline solution havin

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: a saline solution has a concentration ratio of 2.5 mg of salt in 100 ml of solution how many milligrams of salt will be needed to produce 500 milliliters of a saline solution havin      Log On


   

Question 1163152: a saline solution has a concentration ratio of 2.5 mg of salt in 100 ml of solution how many milligrams of salt will be needed to produce 500 milliliters of a saline solution having this same concentrate
also a different problem
a caplet contains 325 milligrams of medication how many caplets contain 975 milligrams of medication?
Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!
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500 millilitres is  5  (five)  times as much as  100 millilitres.

Does it tell you something ?

In this case people say 

    2.5 milligrams of salt relate to 100 millilitres of the solution

    as x milligrams of salt relate to 500 milliliters of the solution

Mathematically,  these words are equivalent to  (and are replaced by)  this  PROPORTION

     2.5%2F100 = x%2F500.

From the proportion,

     x = %282.5%2A500%29%2F100 = 2.5*5 = 12.5.

ANSWER.   12.5  milligrams of salt are needed.

Solved.   //   As you see,  the answer value of  12.5 milligrams of salt is  5  (five)  times as much as  2.5 milligrams of salt

                    -- in precise accordance with the common sense.


            Solve your next problem by the same way,  repeating the same mantra.


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On proportions,  see the lessons
    - Proportions
    - Using proportions to solve word problems
    - Using proportions to solve word problems in Physics
    - Using proportions to solve Chemistry problems
    - Typical problems on proportions
    - Using proportions to estimate the number of fish in a lake
    - HOW TO algebreze and solve these problems using proportions
    - Problems on proportions for mental solution
    - Selected problems on proportions from the archive
    - OVERVIEW of lessons on proportions
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