Algebra practice question

Answer: 10

(x + 3x)/2 = 2x ≥ 20 → x ≥ 10.

Common wrong answers

If you answered 5

5 comes from 4x ≥ 20, forgetting to divide by 2.

If you answered 20

20 is the average, not x.

If you answered 40

40 is 2 × 20.

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