Saturday

January 31, 2015

January 31, 2015

Posted by **Vicki** on Thursday, February 16, 2012 at 1:16pm.

- MATH HELP -
**MathMate**, Thursday, February 16, 2012 at 2:37pm0.......30%......70%......95%......100

.............40.......25..............

Look at the proportions above,

between 70% and 30%, the difference is 40%

and between 95% and 70%, the difference is 25%.

They should be mixed in the inverse ratio, i.e.

25 parts of 30% to 40 parts of 95%.

Converted to ratios,

25/(25+40)=25/65=5/13

40/(25+40)=40/65=9/13

So we mix (5/13) parts of 30% with (8/13) parts of 95% alcohol.

You can also solve it with algebra:

Let x be the fraction of 30% alcohol, then

30%*x+95%*(1-x) = 70%

Solve for x to get 5/13

**Answer this Question**

**Related Questions**

math - In what proportion should 95% alcohol be mixed with 30% alcohol to make ...

math - how many oz of 25% alcohol solution must be mixed with 14oz of 30oz ...

pharmacy math who helps me step by step for me - How much 30% alcohol, 45% ...

Math - Solution A is 80% Alcohol and Solution B is 30% Alcohol. How many Liters ...

math - Mary has a solution that is 60% alcohol and another that is 20% alcohol. ...

MATH - Suppose that you have a supply of a 25% solution of alcohol and a 75% ...

Math - Suppose that you have a supply of a 25% solution of alcohol and a 75% ...

algebra HELP - mary has a solution that is 60% alcohol and another that is 20% ...

math - A 5% alcohol solution is mixed with 15% alcohol solution to make a 25mlof...

algebra - moonshine has 50 liters of a 70% alcohol solution.how many liters of ...