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To solve the inequality 15x + 300 ≥ 600, we need to isolate the variable x on one side of the inequality.
Subtracting 300 from both sides:
15x ≥ 600 - 300
15x ≥ 300
Dividing both sides by 15:
x ≥ 300/15
x ≥ 20
Therefore, the correct solution is x ≥ 20.