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olganol [36]
3 years ago
12

A student has a 2% salt water solution and a 7% salt water solution. To best imitate salt water at a local beach, he needs 1 lit

er of a 3.5% salt water solution. He defines x as the amount of 2% solution and writes this equation:
0.2x + 0.7(x – 1) = 0.35(1)
He solves the equation and determines that x is about 1.17 liters. He interprets this as needing 1.17 liters of 2% solution to make 1 liter of 3.5% solution.

What errors did the student make? Check all that apply.

→The percent values were written incorrectly in the equation.
→The amount of 7% solution should be written as 1 – x, not x – 1.
→The equation as written is solved incorrectly. x ≠ 1.17.
→x must represent the amount of the more highly concentrated solution.
→The interpretation is incorrect. 1 liter of 2% solution is needed to make 1.17 liters of 3.5% solution.
Mathematics
2 answers:
FromTheMoon [43]3 years ago
8 0

Let

x-------> the amount of 2\% solution

y--------> the amount of 7\% solution

we know that

2\%=0.02\\7\%=0.07\\3.5\%=0.035

so

x+y=1

y=1-x -------> equation A

0.02x+0.07y=0.035 -------> equation B

substitute equation A in equation B

0.02x+0.07(1-x)=0.035

0.02x+0.07-0.07x=0.035

0.05x=0.035

x=0.7\ liters

find the value of y

y=1-x

y=1-0.7=0.3\ liters

therefore

The student need 0.7\ liters of 2\% solution and 0.3\ liters of 7\% solution

<u>the answer is</u>

A) The percent values were written incorrectly in the equation

B) The amount of 7% solution should be written as 1 – x, not x – 1.

Sindrei [870]3 years ago
5 0

Answer:

A and B

Step-by-step explanation:

i took the test

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