Set 9: Linear Equations (Intermediate)

Explanation

Answer: C

A student has grades of 80, 85, and 90. What must she get on the 4th test to average 88?

✓ Correct

100

Detailed Explanation

Choice C is correct. Choice D is the correct answer. 1. Equation: $\frac{80 + 85 + 90 + x}{4} = 88$ 2. Sum: $255+ x = 352$ 3. Subtract 255: $x = 97$ Choice B is incorrect because it results from an error in the solution process. Choice D is incorrect because it results from an error in the solution process. Choice A is incorrect because it results from an error in the solution process.

Key Steps:

•

The correct answer is 97

Why others are wrong:

A: Choice A is incorrect and may result from a calculation error.

B: Choice B is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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