Question

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 liter 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.

Answer 1

Its A and B

Step-by-step explanation:

Answer 2

The answer is A & B

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.