Set 4: Linear Equations (Advanced)

Explanation

Answer: B

The ratio of red to blue marbles is 4:5. If there are 36 marbles, how many are blue?

✓ Correct

Detailed Explanation

Choice B is correct. Choice A is the correct answer. 1. Equation: $4x + 5 x = 36$ 2. Combine: $9x = 36$ 3. Divide by 9: $x = 4$ 4. Blue: $5(4) = 20$ Choice D is incorrect because this is red marbles. Choice C is incorrect because it results from an error in the solution process. Choice B is incorrect because it results from an error in the solution process.

Key Steps:

•

The correct answer is 20

Why others are wrong:

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

C: Choice C 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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