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Need an answer with some explanation [#permalink]
17 Jun 2011, 01:50
1. The current ratio of boys to girls at a certain school is 2to 5. If 12 additional boys were added to the school, the new ratio of boys to girls would be 4 to 9. How many boys currently attend the school? (A) 27 (B) 48 (C) 54 (D) 72 (E) 108