Set 13: Linear Equations (Advanced)

Explanation

Answer: D

Solve: $\frac{x}{2} + \frac{x}{5} = 7$

✓ Correct

Detailed Explanation

Choice D is correct. Choice D is the correct answer. 1. LCD: 10 2. Multiply by 10: $5x + 2 x = 70$ 3. Combine: $7x = 70$ 4. Divide by 7: $x = 10$ 5. Verify: $5+ 2 = 7$ ✓ Choice B 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. Choice C is incorrect because it results from an error in the solution process.

Key Steps:

•

The correct answer is 10

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.

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

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