Set 6: Linear Equations (Advanced)

Explanation

Answer: D

A tank has 100 liters and drains at 5 liters/min. Another tank has 20 liters and fills at 3 liters/min. When will they be equal?

✓ Correct

Detailed Explanation

Choice D is correct. Choice A is the correct answer. 1. Equation: $100- 5 x = 20 + 3 x$ 2. Add 5 x: $100= 20 + 8 x$ 3. Subtract 20: $80= 8 x$ 4. Divide by 8: $10= x$ 5. Verify: $100- 50 = 50$ and $20+ 30 = 50$ ✓ Choice C 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 D 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.

← Previous Next →

🎯 Keep Practicing!

Master all sections for your best SAT score

📚Reading & Writing→📖Vocabulary→