Question
There are 40 more teachers in School C than in School D. After 25% of the teachers left School C and 50% of teachers left School D, the number of teachers who remained in School C is thrice that of the number of teachers in School D. Find the number of teachers in School C at first.
4 m

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There are 40 more teachers in School C than in School D. After 25% of the teachers left School C and 50% of teachers left School D, the number of teachers who remained in School C is thrice that of the number of teachers in School D. Find the number of teachers in School C at first.