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snow_lady [41]
3 years ago
12

Marna is playing a game where you score −5 points each time youguess the correct answer. The goal is to get the lowest score. To

winthe game, Marna must have a score less than −80 points. How manycorrect answers does Marna need to win the game?
Mathematics
1 answer:
pishuonlain [190]3 years ago
8 0

She would need to score 16 correct answers, because 80/5 = 16.
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URGENT PLEASE ANSWER THESE
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Answer:

1A) 2 gallons of 20% solution and 3 gallons 15% solution needed

1B) 4 gallons of 20% solution and 1 gallons 15% solution needed

Step-by-step explanation:

1A) adding 20% salt and 15% water making 5 gallons of 17%

20% salt + 15% salt = 5 gallons of 17% salt

0.20x + 0.15(5 - x) = 0.17(5)

0.20x + 0.75 - 0.15x = 0.85

0.20x + 0.75 - 0.75 - 0.15x = 0.85 - 0.75

0.20x - 0.15x = 0.10

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x = 2 gallons (amount of 20% solution needed)

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1B)

0.20x + 0.15(5 - x) = 0.19(5)

0.20x + 0.75 - 0.15x = 0.95

0.20x + 0.75 - 0.75 - 0.15x = 0.95 - 0.75

0.20x - 0.15x = 0.20

0.05x = 0.20

0.05x / 0.05 = 0.20/0.05

x = 4 gallons (amount of 20% solution needed)

5 - x = 5 - 4 = 1 gallons (amount of 15% solution needed)

Learn more about System of Equations here: brainly.com/question/12526075

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