10
algebra

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?

A

15

B

8

C

12

D

10

Correct Answer: D

Choice Bhoice A is the correct answer.

  1. Equation: 100−5x=20+3x100 - 5x = 20 + 3x
  2. Add 5x: 100=20+8x100 = 20 + 8x
  3. Subtract 20: 80=8x80 = 8x
  4. Divide by 8: 10=x10 = x
  5. Verify: 100−50=50100 - 50 = 50 and 20+30=5020 + 30 = 50 ✓

Choice Bhoice C is incorrect because calculation error.

Choice Bhoice D is incorrect because calculation error.

Choice Bhoice D is incorrect because calculation error.

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Linear Functions Set 20