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alvalynnw
01.06.2020 •
Mathematics
Kim's softball team is playing in the championship game. They are losing by a score of 17 to 6. There are 4 innings to go. Kim wants to know how many runs her team needs per inning to win the game if the other team does not score. (Each run is worth 1 point.) write an inequality to determine the number of points per inning, p, kims team could have scored. Find the minimum whole number of points kims team could have scored.
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Ответ:
3 L of 30% and 2 L of 14% solution are required
Step-by-step explanation:
I like to work mixture problems using a device I learned from a nursing school student. It is an X diagram with the solution strengths on the left, the mixture strength in the middle, and numbers on the right that are the differences along the diagonals.
Here, the upper difference is 9.6 = 23.6 - 14; the lower difference is 6.4 = 30 - 23.6. These differences, 9.6 and 6.4 can be divided by their common factor (3.2) to see that they are in the ratio 3:2. That is,
... 9.6 : 6.4 = 3 : 2
The upper difference and lower difference represent the ratio of the upper and lower constituent solutions (30% and 14%). Our result means that the ratio of 30% solution to 14% solution is 3 : 2.
As it happens, these ratio units, 3 and 2 sum to 5, which is precisely the number of liters of solution we want. Hence we want ...
... 3 liters of 30% solution and 2 liters of 14% solution.
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Comment on the tool
This tool can be used with virtually any mixture problem—even problems involving dividing investment amounts between accounts that have different interest rates. (Figure the mix that gives the average rate of return on the total investment value.)
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Alternate solution method
If you want to write an equation, you write it for the total amount of acid in the solution. Let x represent the number of liters of 30% solution (the strongest contributor). Then that equation is ...
... 0.30x + 0.14(5-x) = 0.236·5
... 0.16x + 0.7 = 1.18 . . . . eliminate parenthses, simplify
... x = 0.48/0.16 = 3 . . . . subtract 0.7, divide by the coefficient of x
3 liters of 30% solution are required; 2 liters of 14% solution.