Question
There are 9 more teachers in School A than in School B. After 20% of the teachers left School A and 50% of teachers left School B, the number of teachers who remained in School A is four times that of the number of teachers in School B. Find the number of teachers in School A at first.
4 m

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There are 9 more teachers in School A than in School B. After 20% of the teachers left School A and 50% of teachers left School B, the number of teachers who remained in School A is four times that of the number of teachers in School B. Find the number of teachers in School A at first.