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Apricot
 one year ago
Faith mixes 14 liters of 12% acid solution with a 30% acid solution to make an 18% acid solution.
How many liters of 30% solution did she use?
A.
12
B.
4.7
C.
7
D.
21
Apricot
 one year ago
Faith mixes 14 liters of 12% acid solution with a 30% acid solution to make an 18% acid solution. How many liters of 30% solution did she use? A. 12 B. 4.7 C. 7 D. 21

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dan815
 one year ago
Best ResponseYou've already chosen the best response.2would you like to learn how to do it?

dan815
 one year ago
Best ResponseYou've already chosen the best response.2okay here is something you can get with some intuition so lets say for the 14 liters half of it is the 0.3 solution and half of it is the 0.12 solution

dan815
 one year ago
Best ResponseYou've already chosen the best response.2you would expect the mixed solution to be the average of 0.30,0.12 (0.3+0.12)/2 = 0.21

dan815
 one year ago
Best ResponseYou've already chosen the best response.2and we see that our mixed solution actually has 0.18 which lower than the average, so we cant use 7 liters for 0.3 and 7 liters for 0.12

dan815
 one year ago
Best ResponseYou've already chosen the best response.2you would use more for the 0.12 and less for the 0.3 so that our mix is lower

dan815
 one year ago
Best ResponseYou've already chosen the best response.2from this we can already reason out the answer

dan815
 one year ago
Best ResponseYou've already chosen the best response.2because in your choices there is only one choice that gives you a value that is less than half for the 0.3

dan815
 one year ago
Best ResponseYou've already chosen the best response.2i can show you how to actually get that value 4.7 too if you are interested in learning

Apricot
 one year ago
Best ResponseYou've already chosen the best response.0no, thank you. I've gotta continue some other school work :)
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