Set 10: Linear Equations

Explanation

Answer: A

A concrete mix is 1 part cement, 2 parts sand, 3 parts gravel. For 120 kg of concrete, how much sand?

✓ Correct

Detailed Explanation

Choice A is correct. Choice C is the correct answer. 1. Total Parts: $1+ 2 + 3 = 6$ parts. 2. Weight per part: $120/ 6 = 20$ kg. 3. Sand: $2\text{ parts} \times 20 = 40$ kg. Choice D is incorrect because this is cement. Choice C is incorrect because this is gravel. Choice B is incorrect because it results from an error in the solution process.

Key Steps:

•

The correct answer is 40

Why others are wrong:

B: Choice B 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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