Rohan started the day with the same number of phone calls to make............how many calls did Rohan have left to make?

Question

Rohan started the day with the same number of phone calls to make as Ketan.
By lunchtime, Rohan had made two-fifths of his phone calls, while Ketan had completed only a quarter of his.
If the difference between the remaining numbers of calls to be made was nine, how many calls did Rohan have left to make?

Answer 1

36

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Number of phone calls - n
Rohan has made n*2/5--> remaining 3n/5
Ketan has made n*1/4--> remaining 3n/4
3n/4-3n/5=9 ---> n=60 number of calls each had
Rohan's remaining calls- 3*60/5=36