Question
There are 45 more teachers in School D than in School E. After 20% of the teachers left School D and 50% of teachers left School E, the number of teachers who remained in School D is four times that of the number of teachers in School E. Find the number of teachers in School D at first.
4 m

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There are 45 more teachers in School D than in School E. After 20% of the teachers left School D and 50% of teachers left School E, the number of teachers who remained in School D is four times that of the number of teachers in School E. Find the number of teachers in School D at first.