The air in a recently used classroom 9m x 7m x 9m tested 0.12% carbon dioxide. How many cubic meters of fresh air must be admitted per minute in order that 10 minutes later it shall contain not over 0.06% carbon dioxide. Fresh air contains 0.04% carbon dioxide. Assume immediate mixing of fresh with stale air. (A) 14 (B) 11 (C) 15 (D) 19 (E) 17

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