Achemistry teacher needs to mix a 20% salt solution with a 80% salt solution to make 15 qt of a 40% salt solution. how many quarts of each solution should the teacher mix to get the desired result?

10 quarts of 20 % salt solution mixed with 5 quarts of 80 % salt solution to make 15 quarts of 40 % salt solution

Solution:

The final mixture is 15 quarts

Let amount of 20% solution to be mixed, be x

Then, the amount of 80 % solution to be mixed is 15 - x

Thus, we can say,

"x" quarts of 20 % salt solution mixed with (15 - x) quarts of 80 % salt solution to make 15 quarts of 40 % salt solution

thus, we frame a equation as,

Thus 10 quarts of 20 % solution is mixed

Then, 15 - x = 15 - 10 = 5

5 quarts of 80 % salt solution is mixed

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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the probability that a bird is green (.30) is true

step-by-step explanation: