Question
There are 39 more teachers in School Q than in School R. After 20% of the teachers left School Q and 50% of teachers left School R, the number of teachers who remained in School Q is four times that of the number of teachers in School R. Find the number of teachers in School Q at first.
4 m

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There are 39 more teachers in School Q than in School R. After 20% of the teachers left School Q and 50% of teachers left School R, the number of teachers who remained in School Q is four times that of the number of teachers in School R. Find the number of teachers in School Q at first.