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

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