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

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